215256877057 has 8 divisors (see below), whose sum is σ = 222798220200. Its totient is φ = 207723446784.

The previous prime is 215256877049. The next prime is 215256877081. The reversal of 215256877057 is 750778652512.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 6915751921 + 208341125136 = 83161^2 + 456444^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 215256877057 - 2³ = 215256877049 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 215256876989 and 215256877007.

It is not an unprimeable number, because it can be changed into a prime (215256817057) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1922832 + ... + 2031697.

It is an arithmetic number, because the mean of its divisors is an integer number (27849777525).

Almost surely, 2^215256877057 is an apocalyptic number.

It is an amenable number.

215256877057 is a deficient number, since it is larger than the sum of its proper divisors (7541343143).

215256877057 is a wasteful number, since it uses less digits than its factorization.

215256877057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3956435.

The product of its (nonzero) digits is 8232000, while the sum is 55.

The spelling of 215256877057 in words is "two hundred fifteen billion, two hundred fifty-six million, eight hundred seventy-seven thousand, fifty-seven".