13249961172 has 72 divisors (see below), whose sum is σ = 38436670272. Its totient is φ = 3769977600.

The previous prime is 13249961111. The next prime is 13249961173. The reversal of 13249961172 is 27116994231.

13249961172 is a `hidden beast` number, since 1 + 3 + 24 + 9 + 9 + 611 + 7 + 2 = 666.

It is a super-2 number, since 2×13249961172² (a number of 21 digits) contains 22 as substring.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13249961173) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 48354 + ... + 169817.

Almost surely, 2^13249961172 is an apocalyptic number.

13249961172 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

13249961172 is an abundant number, since it is smaller than the sum of its proper divisors (25186709100).

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

13249961172 is a wasteful number, since it uses less digits than its factorization.

13249961172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 218429 (or 218424 counting only the distinct ones).

The product of its digits is 163296, while the sum is 45.

The spelling of 13249961172 in words is "thirteen billion, two hundred forty-nine million, nine hundred sixty-one thousand, one hundred seventy-two".