256167021502 has 48 divisors (see below), whose sum is σ = 449466107328. Its totient is φ = 109178072640.

The previous prime is 256167021479. The next prime is 256167021511. The reversal of 256167021502 is 205120761652.

It is a super-2 number, since 2×256167021502² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14784148 + ... + 14801464.

It is an arithmetic number, because the mean of its divisors is an integer number (9363877236).

Almost surely, 2^256167021502 is an apocalyptic number.

256167021502 is a deficient number, since it is larger than the sum of its proper divisors (193299085826).

256167021502 is a wasteful number, since it uses less digits than its factorization.

256167021502 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18161 (or 18154 counting only the distinct ones).

The product of its (nonzero) digits is 50400, while the sum is 37.

The spelling of 256167021502 in words is "two hundred fifty-six billion, one hundred sixty-seven million, twenty-one thousand, five hundred two".