13256722551256 has 8 divisors (see below), whose sum is σ = 24856354783620. Its totient is φ = 6628361275624.

The previous prime is 13256722551209. The next prime is 13256722551329. The reversal of 13256722551256 is 65215522765231.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 828545159446 + ... + 828545159461.

Almost surely, 2^{13256722551256} is an apocalyptic number.

It is an amenable number.

13256722551256 is a deficient number, since it is larger than the sum of its proper divisors (11599632232364).

13256722551256 is a wasteful number, since it uses less digits than its factorization.

13256722551256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1657090318913 (or 1657090318909 counting only the distinct ones).

The product of its digits is 7560000, while the sum is 52.

The spelling of 13256722551256 in words is "thirteen trillion, two hundred fifty-six billion, seven hundred twenty-two million, five hundred fifty-one thousand, two hundred fifty-six".