215771154256 has 30 divisors (see below), whose sum is σ = 486310753770. Its totient is φ = 92473351488.

The previous prime is 215771154227. The next prime is 215771154271. The reversal of 215771154256 is 652451177512.

It is a happy number.

215771154256 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 193790126656 + 21981027600 = 440216^2 + 148260^2 .

It is a hoax number, since the sum of its digits (46) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 137608371 + ... + 137609938.

It is an arithmetic number, because the mean of its divisors is an integer number (16210358459).

Almost surely, 2^215771154256 is an apocalyptic number.

It is an amenable number.

215771154256 is an abundant number, since it is smaller than the sum of its proper divisors (270539599514).

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

215771154256 is a wasteful number, since it uses less digits than its factorization.

215771154256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 275218331 (or 275218318 counting only the distinct ones).

The product of its digits is 588000, while the sum is 46.

The spelling of 215771154256 in words is "two hundred fifteen billion, seven hundred seventy-one million, one hundred fifty-four thousand, two hundred fifty-six".