13438636937478 has 24 divisors (see below), whose sum is σ = 30056306270016. Its totient is φ = 4335044173200.

The previous prime is 13438636937441. The next prime is 13438636937489. The reversal of 13438636937478 is 87473963683431.

13438636937478 is a `hidden beast` number, since 1 + 3 + 4 + 3 + 8 + 63 + 6 + 93 + 7 + 478 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12041788813 + ... + 12041789928.

It is an arithmetic number, because the mean of its divisors is an integer number (1252346094584).

Almost surely, 2^{13438636937478} is an apocalyptic number.

13438636937478 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

13438636937478 is an abundant number, since it is smaller than the sum of its proper divisors (16617669332538).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

13438636937478 is a wasteful number, since it uses less digits than its factorization.

13438636937478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24083578780 (or 24083578777 counting only the distinct ones).

The product of its digits is 1316818944, while the sum is 72.

The spelling of 13438636937478 in words is "thirteen trillion, four hundred thirty-eight billion, six hundred thirty-six million, nine hundred thirty-seven thousand, four hundred seventy-eight".