215802509796 has 72 divisors (see below), whose sum is σ = 566134208640. Its totient is φ = 71879532192.

The previous prime is 215802509761. The next prime is 215802509807. The reversal of 215802509796 is 697905208512.

215802509796 is a `hidden beast` number, since 2 + 1 + 580 + 2 + 50 + 9 + 7 + 9 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1206190 + ... + 1373498.

It is an arithmetic number, because the mean of its divisors is an integer number (7862975120).

Almost surely, 2^215802509796 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 215802509796, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (283067104320).

215802509796 is an abundant number, since it is smaller than the sum of its proper divisors (350331698844).

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

215802509796 is a wasteful number, since it uses less digits than its factorization.

215802509796 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168655 (or 168641 counting only the distinct ones).

The product of its (nonzero) digits is 2721600, while the sum is 54.

The spelling of 215802509796 in words is "two hundred fifteen billion, eight hundred two million, five hundred nine thousand, seven hundred ninety-six".