8661557696 has 28 divisors (see below), whose sum is σ = 18750305400. Its totient is φ = 3937071360.

The previous prime is 8661557657. The next prime is 8661557699. The reversal of 8661557696 is 6967551668.

It is a super-2 number, since 2×8661557696² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8661557699) 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, 6150971 + ... + 6152378.

Almost surely, 2^8661557696 is an apocalyptic number.

It is an amenable number.

8661557696 is an abundant number, since it is smaller than the sum of its proper divisors (10088747704).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

8661557696 is a wasteful number, since it uses less digits than its factorization.

8661557696 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12303372 (or 12303362 counting only the distinct ones).

The product of its digits is 16329600, while the sum is 59.

The square root of 8661557696 is about 93067.4900059092. The cubic root of 8661557696 is about 2053.6763454997.

The spelling of 8661557696 in words is "eight billion, six hundred sixty-one million, five hundred fifty-seven thousand, six hundred ninety-six".