23927537138 has 4 divisors (see below), whose sum is σ = 35891305710. Its totient is φ = 11963768568.

The previous prime is 23927537129. The next prime is 23927537191. The reversal of 23927537138 is 83173572932.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 19893127849 + 4034409289 = 141043^2 + 63517^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5981884283 + ... + 5981884286.

Almost surely, 2^23927537138 is an apocalyptic number.

23927537138 is a deficient number, since it is larger than the sum of its proper divisors (11963768572).

23927537138 is a wasteful number, since it uses less digits than its factorization.

23927537138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11963768571.

The product of its digits is 1905120, while the sum is 50.

The spelling of 23927537138 in words is "twenty-three billion, nine hundred twenty-seven million, five hundred thirty-seven thousand, one hundred thirty-eight".