999999999999977 has 8 divisors (see below), whose sum is σ = 1006716159792000. Its totient is φ = 993283903546864.

The previous prime is 999999999999947. The next prime is 999999999999989. The reversal of 999999999999977 is 779999999999999.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 999999999999977 - 2²² = 999999995805673 is a prime.

It is a super-9 number, since 9×999999999999977⁹ (a number of 136 digits) contains 999999999 as substring.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is a zygodrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (999999999999947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16062518 + ... + 47518464.

It is an arithmetic number, because the mean of its divisors is an integer number (125839519974000).

Almost surely, 2^{999999999999977} is an apocalyptic number.

It is an amenable number.

999999999999977 is a deficient number, since it is larger than the sum of its proper divisors (6716159792023).

999999999999977 is a wasteful number, since it uses less digits than its factorization.

999999999999977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31669455.

The product of its digits is 124551425588121, while the sum is 131.

The spelling of 999999999999977 in words is "nine hundred ninety-nine trillion, nine hundred ninety-nine billion, nine hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred seventy-seven".