9215505656 has 144 divisors (see below), whose sum is σ = 22006468800. Its totient is φ = 3594769920.

The previous prime is 9215505641. The next prime is 9215505679. The reversal of 9215505656 is 6565055129.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 6403385 + ... + 6404823.

It is an arithmetic number, because the mean of its divisors is an integer number (152822700).

Almost surely, 2^9215505656 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 9215505656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11003234400).

9215505656 is an abundant number, since it is smaller than the sum of its proper divisors (12790963144).

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

9215505656 is a wasteful number, since it uses less digits than its factorization.

9215505656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1538 (or 1496 counting only the distinct ones).

The product of its (nonzero) digits is 405000, while the sum is 44.

The square root of 9215505656 is about 95997.4252571391. The cubic root of 9215505656 is about 2096.5556277818. Note that the first 3 decimals are identical.

The spelling of 9215505656 in words is "nine billion, two hundred fifteen million, five hundred five thousand, six hundred fifty-six".