13438501656 has 24 divisors (see below), whose sum is σ = 33597673980. Its totient is φ = 4479311248.

The previous prime is 13438501627. The next prime is 13438501669. The reversal of 13438501656 is 65610583431.

It is a tau number, because it is divible by the number of its divisors (24).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 556081 + ... + 579743.

Almost surely, 2^13438501656 is an apocalyptic number.

It is an amenable number.

13438501656 is an abundant number, since it is smaller than the sum of its proper divisors (20159172324).

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

13438501656 is an frugal number, since it uses more digits than its factorization.

13438501656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47335 (or 23668 counting only the distinct ones).

The product of its (nonzero) digits is 259200, while the sum is 42.

The spelling of 13438501656 in words is "thirteen billion, four hundred thirty-eight million, five hundred one thousand, six hundred fifty-six".