999671587028977 has 4 divisors (see below), whose sum is σ = 999671651568100. Its totient is φ = 999671522489856.

The previous prime is 999671587028963. The next prime is 999671587028981. The reversal of 999671587028977 is 779820785176999.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 630838371318016 + 368833215710961 = 25116496^2 + 19205031^2 .

It is a 3-Lehmer number, since φ(999671587028977) divides (999671587028977-1)³.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-999671587028977 is a prime.

It is a deceptive number, since it divides R_{999671587028976}.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (999671587028927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6453913 + ... + 45177385.

It is an arithmetic number, because the mean of its divisors is an integer number (249917912892025).

It is a Poulet number, since it divides 2^{999671587028976}-1.

Almost surely, 2^{999671587028977} is an apocalyptic number.

999671587028977 is the 25815649-th pentagonal number.

It is an amenable number.

999671587028977 is a deficient number, since it is larger than the sum of its proper divisors (64539123).

999671587028977 is a wasteful number, since it uses less digits than its factorization.

999671587028977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64539122.

The product of its (nonzero) digits is 60491370240, while the sum is 94.

The spelling of 999671587028977 in words is "nine hundred ninety-nine trillion, six hundred seventy-one billion, five hundred eighty-seven million, twenty-eight thousand, nine hundred seventy-seven".