8619664656 has 20 divisors (see below), whose sum is σ = 22267467152. Its totient is φ = 2873221536.

The previous prime is 8619664553. The next prime is 8619664661. The reversal of 8619664656 is 6564669168.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 8619664596 and 8619664605.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 89788126 + ... + 89788221.

Almost surely, 2^8619664656 is an apocalyptic number.

It is an amenable number.

8619664656 is an abundant number, since it is smaller than the sum of its proper divisors (13647802496).

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

8619664656 is a wasteful number, since it uses less digits than its factorization.

8619664656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 179576358 (or 179576352 counting only the distinct ones).

The product of its digits is 11197440, while the sum is 57.

The square root of 8619664656 is about 92842.1491349699. The cubic root of 8619664656 is about 2050.3600126002.

The spelling of 8619664656 in words is "eight billion, six hundred nineteen million, six hundred sixty-four thousand, six hundred fifty-six".