215256351406 has 32 divisors (see below), whose sum is σ = 348579510912. Its totient is φ = 99321884160.

The previous prime is 215256351383. The next prime is 215256351449. The reversal of 215256351406 is 604153652512.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 493755 + ... + 821161.

It is an arithmetic number, because the mean of its divisors is an integer number (10893109716).

Almost surely, 2^215256351406 is an apocalyptic number.

215256351406 is a deficient number, since it is larger than the sum of its proper divisors (133323159506).

215256351406 is a wasteful number, since it uses less digits than its factorization.

215256351406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 327804.

The product of its (nonzero) digits is 216000, while the sum is 40.

The spelling of 215256351406 in words is "two hundred fifteen billion, two hundred fifty-six million, three hundred fifty-one thousand, four hundred six".