2151623674538 has 32 divisors (see below), whose sum is σ = 3480645364560. Its totient is φ = 991644595200.

The previous prime is 2151623674523. The next prime is 2151623674589. The reversal of 2151623674538 is 8354763261512.

It can be written as a sum of positive squares in 8 ways, for example, as 1193540955049 + 958082719489 = 1092493^2 + 978817^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 2151623674538.

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, 144425906 + ... + 144440802.

Almost surely, 2^{2151623674538} is an apocalyptic number.

2151623674538 is a deficient number, since it is larger than the sum of its proper divisors (1329021690022).

2151623674538 is a wasteful number, since it uses less digits than its factorization.

2151623674538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22442.

The product of its digits is 7257600, while the sum is 53.

The spelling of 2151623674538 in words is "two trillion, one hundred fifty-one billion, six hundred twenty-three million, six hundred seventy-four thousand, five hundred thirty-eight".