3640579644949 has 16 divisors (see below), whose sum is σ = 3966929615152. Its totient is φ = 3320947703808.

The previous prime is 3640579644859. The next prime is 3640579644959. The reversal of 3640579644949 is 9494469750463.

It can be written as a sum of positive squares in 8 ways, for example, as 1486465708849 + 2154113936100 = 1219207^2 + 1467690^2 .

It is a cyclic number.

It is not a de Polignac number, because 3640579644949 - 2¹⁷ = 3640579513877 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3640579644959) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1296264 + ... + 2993569.

It is an arithmetic number, because the mean of its divisors is an integer number (247933100947).

Almost surely, 2^{3640579644949} is an apocalyptic number.

It is an amenable number.

3640579644949 is a deficient number, since it is larger than the sum of its proper divisors (326349970203).

3640579644949 is a wasteful number, since it uses less digits than its factorization.

3640579644949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4290616.

The product of its (nonzero) digits is 705438720, while the sum is 70.

The spelling of 3640579644949 in words is "three trillion, six hundred forty billion, five hundred seventy-nine million, six hundred forty-four thousand, nine hundred forty-nine".