87645668977 has 4 divisors (see below), whose sum is σ = 87835790196. Its totient is φ = 87455547760.

The previous prime is 87645668969. The next prime is 87645669017. The reversal of 87645668977 is 77986654678.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 54158132961 + 33487536016 = 232719^2 + 182996^2 .

It is a cyclic number.

It is not a de Polignac number, because 87645668977 - 2³ = 87645668969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87645668947) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 95059918 + ... + 95060839.

It is an arithmetic number, because the mean of its divisors is an integer number (21958947549).

Almost surely, 2^87645668977 is an apocalyptic number.

It is an amenable number.

87645668977 is a deficient number, since it is larger than the sum of its proper divisors (190121219).

87645668977 is a wasteful number, since it uses less digits than its factorization.

87645668977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 190121218.

The product of its digits is 853493760, while the sum is 73.

The spelling of 87645668977 in words is "eighty-seven billion, six hundred forty-five million, six hundred sixty-eight thousand, nine hundred seventy-seven".