13256646172 has 72 divisors (see below), whose sum is σ = 30725267328. Its totient is φ = 4861075200.

The previous prime is 13256646167. The next prime is 13256646181. The reversal of 13256646172 is 27164665231.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14547 + ... + 163477.

It is an arithmetic number, because the mean of its divisors is an integer number (426739824).

Almost surely, 2^13256646172 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 13256646172, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15362633664).

13256646172 is an abundant number, since it is smaller than the sum of its proper divisors (17468621156).

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

13256646172 is a wasteful number, since it uses less digits than its factorization.

13256646172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148987 (or 148968 counting only the distinct ones).

The product of its digits is 362880, while the sum is 43.

The spelling of 13256646172 in words is "thirteen billion, two hundred fifty-six million, six hundred forty-six thousand, one hundred seventy-two".