215406053256 has 32 divisors (see below), whose sum is σ = 538533302400. Its totient is φ = 71799595200.

The previous prime is 215406053209. The next prime is 215406053293. The reversal of 215406053256 is 652350604512.

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 7 ways as a sum of consecutive naturals, for example, 664465 + ... + 933983.

It is an arithmetic number, because the mean of its divisors is an integer number (16829165700).

Almost surely, 2^215406053256 is an apocalyptic number.

It is an amenable number.

215406053256 is an abundant number, since it is smaller than the sum of its proper divisors (323127249144).

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

215406053256 is a wasteful number, since it uses less digits than its factorization.

215406053256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 302829 (or 302825 counting only the distinct ones).

The product of its (nonzero) digits is 216000, while the sum is 39.

Adding to 215406053256 its reverse (652350604512), we get a palindrome (867756657768).

The spelling of 215406053256 in words is "two hundred fifteen billion, four hundred six million, fifty-three thousand, two hundred fifty-six".