215990794944 has 672 divisors, whose sum is σ = 718139036160. Its totient is φ = 64049356800.

The previous prime is 215990794931. The next prime is 215990794951. The reversal of 215990794944 is 449497099512.

215990794944 is a `hidden beast` number, since 2 + 1 + 59 + 90 + 7 + 9 + 494 + 4 = 666.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 414569404 + ... + 414569924.

It is an arithmetic number, because the mean of its divisors is an integer number (1068659280).

Almost surely, 2^215990794944 is an apocalyptic number.

215990794944 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 215990794944, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (359069518080).

215990794944 is an abundant number, since it is smaller than the sum of its proper divisors (502148241216).

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

215990794944 is a wasteful number, since it uses less digits than its factorization.

215990794944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 651 (or 629 counting only the distinct ones).

The product of its (nonzero) digits is 29393280, while the sum is 63.

The spelling of 215990794944 in words is "two hundred fifteen billion, nine hundred ninety million, seven hundred ninety-four thousand, nine hundred forty-four".