12641406765 has 64 divisors (see below), whose sum is σ = 22544148480. Its totient is φ = 6006804480.

The previous prime is 12641406731. The next prime is 12641406787. The reversal of 12641406765 is 56760414621.

It is not a de Polignac number, because 12641406765 - 2¹⁷ = 12641275693 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2469849 + ... + 2474961.

It is an arithmetic number, because the mean of its divisors is an integer number (352252320).

Almost surely, 2^12641406765 is an apocalyptic number.

12641406765 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12641406765 is a deficient number, since it is larger than the sum of its proper divisors (9902741715).

12641406765 is a wasteful number, since it uses less digits than its factorization.

12641406765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5574.

The product of its (nonzero) digits is 241920, while the sum is 42.

The spelling of 12641406765 in words is "twelve billion, six hundred forty-one million, four hundred six thousand, seven hundred sixty-five".