3640041261656 has 16 divisors (see below), whose sum is σ = 6831122623800. Its totient is φ = 1818408561984.

The previous prime is 3640041261653. The next prime is 3640041261679. The reversal of 3640041261656 is 6561621400463.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3640041261653) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 201499010 + ... + 201517073.

Almost surely, 2^{3640041261656} is an apocalyptic number.

It is an amenable number.

3640041261656 is a deficient number, since it is larger than the sum of its proper divisors (3191081362144).

3640041261656 is a wasteful number, since it uses less digits than its factorization.

3640041261656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 403017218 (or 403017214 counting only the distinct ones).

The product of its (nonzero) digits is 622080, while the sum is 44.

The spelling of 3640041261656 in words is "three trillion, six hundred forty billion, forty-one million, two hundred sixty-one thousand, six hundred fifty-six".