3640402646465 has 32 divisors (see below), whose sum is σ = 4993089435936. Its totient is φ = 2524151992320.

The previous prime is 3640402646443. The next prime is 3640402646497. The reversal of 3640402646465 is 5646462040463.

It can be written as a sum of positive squares in 16 ways, for example, as 1098983208976 + 2541419437489 = 1048324^2 + 1594183^2 .

It is not a de Polignac number, because 3640402646465 - 2⁶ = 3640402646401 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3447482 + ... + 4377891.

It is an arithmetic number, because the mean of its divisors is an integer number (156034044873).

Almost surely, 2^{3640402646465} is an apocalyptic number.

It is an amenable number.

3640402646465 is a deficient number, since it is larger than the sum of its proper divisors (1352686789471).

3640402646465 is a wasteful number, since it uses less digits than its factorization.

3640402646465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7825829.

The product of its (nonzero) digits is 9953280, while the sum is 50.

The spelling of 3640402646465 in words is "three trillion, six hundred forty billion, four hundred two million, six hundred forty-six thousand, four hundred sixty-five".