12640451607 has 24 divisors (see below), whose sum is σ = 21026079360. Its totient is φ = 7167972240.

The previous prime is 12640451597. The next prime is 12640451623. The reversal of 12640451607 is 70615404621.

12640451607 is a `hidden beast` number, since 1 + 2 + 6 + 4 + 0 + 45 + 1 + 607 = 666.

It is not a de Polignac number, because 12640451607 - 2⁷ = 12640451479 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12640451627) 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, 757557 + ... + 774062.

It is an arithmetic number, because the mean of its divisors is an integer number (876086640).

Almost surely, 2^12640451607 is an apocalyptic number.

12640451607 is a deficient number, since it is larger than the sum of its proper divisors (8385627753).

12640451607 is a wasteful number, since it uses less digits than its factorization.

12640451607 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1531763 (or 1531760 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 36.

The spelling of 12640451607 in words is "twelve billion, six hundred forty million, four hundred fifty-one thousand, six hundred seven".