40644257913 has 12 divisors (see below), whose sum is σ = 67095283008. Its totient is φ = 23225290200.

The previous prime is 40644257879. The next prime is 40644257939. The reversal of 40644257913 is 31975244604.

40644257913 is a `hidden beast` number, since 4 + 0 + 64 + 4 + 2 + 579 + 13 = 666.

40644257913 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 40644257913 - 2¹⁰ = 40644256889 is a prime.

It is not an unprimeable number, because it can be changed into a prime (40644207913) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 322573413 + ... + 322573538.

It is an arithmetic number, because the mean of its divisors is an integer number (5591273584).

Almost surely, 2^40644257913 is an apocalyptic number.

It is an amenable number.

40644257913 is a deficient number, since it is larger than the sum of its proper divisors (26451025095).

40644257913 is a wasteful number, since it uses less digits than its factorization.

40644257913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 645146964 (or 645146961 counting only the distinct ones).

The product of its (nonzero) digits is 725760, while the sum is 45.

The spelling of 40644257913 in words is "forty billion, six hundred forty-four million, two hundred fifty-seven thousand, nine hundred thirteen".