215645360656 has 160 divisors (see below), whose sum is σ = 486600105600. Its totient is φ = 91550269440.

The previous prime is 215645360627. The next prime is 215645360657. The reversal of 215645360656 is 656063546512.

It is not an unprimeable number, because it can be changed into a prime (215645360657) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 95038690 + ... + 95040958.

It is an arithmetic number, because the mean of its divisors is an integer number (3041250660).

Almost surely, 2^215645360656 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 215645360656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (243300052800).

215645360656 is an abundant number, since it is smaller than the sum of its proper divisors (270954744944).

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

215645360656 is a wasteful number, since it uses less digits than its factorization.

215645360656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2697 (or 2691 counting only the distinct ones).

The product of its (nonzero) digits is 3888000, while the sum is 49.

The spelling of 215645360656 in words is "two hundred fifteen billion, six hundred forty-five million, three hundred sixty thousand, six hundred fifty-six".