87917555691 has 48 divisors (see below), whose sum is σ = 154529856000. Its totient is φ = 47019135744.

The previous prime is 87917555689. The next prime is 87917555731. The reversal of 87917555691 is 19655571978.

87917555691 is a `hidden beast` number, since 8 + 7 + 9 + 1 + 75 + 556 + 9 + 1 = 666.

It is not a de Polignac number, because 87917555691 - 2¹ = 87917555689 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is not an unprimeable number, because it can be changed into a prime (87917555651) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 37591 + ... + 421008.

It is an arithmetic number, because the mean of its divisors is an integer number (3219372000).

Almost surely, 2^87917555691 is an apocalyptic number.

87917555691 is a deficient number, since it is larger than the sum of its proper divisors (66612300309).

87917555691 is a wasteful number, since it uses less digits than its factorization.

87917555691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 458808 (or 458805 counting only the distinct ones).

The product of its digits is 23814000, while the sum is 63.

The spelling of 87917555691 in words is "eighty-seven billion, nine hundred seventeen million, five hundred fifty-five thousand, six hundred ninety-one".