215256877055 has 72 divisors (see below), whose sum is σ = 295660525776. Its totient is φ = 150254818560.

The previous prime is 215256877049. The next prime is 215256877081. The reversal of 215256877055 is 550778652512.

It is not a de Polignac number, because 215256877055 - 2²⁴ = 215240099839 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 215256876988 and 215256877006.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 90557027 + ... + 90559403.

Almost surely, 2^215256877055 is an apocalyptic number.

215256877055 is a deficient number, since it is larger than the sum of its proper divisors (80403648721).

215256877055 is a wasteful number, since it uses less digits than its factorization.

215256877055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2565 (or 2495 counting only the distinct ones).

The product of its (nonzero) digits is 5880000, while the sum is 53.

The spelling of 215256877055 in words is "two hundred fifteen billion, two hundred fifty-six million, eight hundred seventy-seven thousand, fifty-five".