12749391612 has 36 divisors (see below), whose sum is σ = 32432914696. Its totient is φ = 4222726560.

The previous prime is 12749391601. The next prime is 12749391631. The reversal of 12749391612 is 21619394721.

12749391612 is a `hidden beast` number, since 1 + 27 + 4 + 9 + 3 + 9 + 1 + 612 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×12749391612² (a number of 21 digits) contains 22 as substring.

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, 1122214 + ... + 1133517.

Almost surely, 2^12749391612 is an apocalyptic number.

12749391612 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

12749391612 is an abundant number, since it is smaller than the sum of its proper divisors (19683523084).

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

12749391612 is a wasteful number, since it uses less digits than its factorization.

12749391612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2255898 (or 2255893 counting only the distinct ones).

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

The spelling of 12749391612 in words is "twelve billion, seven hundred forty-nine million, three hundred ninety-one thousand, six hundred twelve".