215385628455 has 24 divisors (see below), whose sum is σ = 373767758208. Its totient is φ = 114739206336.

The previous prime is 215385628441. The next prime is 215385628457. The reversal of 215385628455 is 554826583512.

215385628455 is a `hidden beast` number, since 2 + 1 + 5 + 3 + 8 + 5 + 628 + 4 + 5 + 5 = 666.

It is not a de Polignac number, because 215385628455 - 2⁴ = 215385628439 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215385628457) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2734252 + ... + 2811921.

It is an arithmetic number, because the mean of its divisors is an integer number (15573656592).

Almost surely, 2^215385628455 is an apocalyptic number.

215385628455 is a deficient number, since it is larger than the sum of its proper divisors (158382129753).

215385628455 is a wasteful number, since it uses less digits than its factorization.

215385628455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5547047 (or 5547044 counting only the distinct ones).

The product of its digits is 11520000, while the sum is 54.

The spelling of 215385628455 in words is "two hundred fifteen billion, three hundred eighty-five million, six hundred twenty-eight thousand, four hundred fifty-five".