12749394766640 has 40 divisors (see below), whose sum is σ = 33876963238560. Its totient is φ = 4371221062656.

The previous prime is 12749394766627. The next prime is 12749394766649. The reversal of 12749394766640 is 4666749394721.

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (12749394766649) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11383387625 + ... + 11383388744.

It is an arithmetic number, because the mean of its divisors is an integer number (846924080964).

Almost surely, 2^{12749394766640} is an apocalyptic number.

12749394766640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12749394766640 is an abundant number, since it is smaller than the sum of its proper divisors (21127568471920).

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

12749394766640 is a wasteful number, since it uses less digits than its factorization.

12749394766640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22766776389 (or 22766776383 counting only the distinct ones).

The product of its (nonzero) digits is 329204736, while the sum is 68.

The spelling of 12749394766640 in words is "twelve trillion, seven hundred forty-nine billion, three hundred ninety-four million, seven hundred sixty-six thousand, six hundred forty".