2640165612564 has 12 divisors (see below), whose sum is σ = 6160386429344. Its totient is φ = 880055204184.

The previous prime is 2640165612547. The next prime is 2640165612569. The reversal of 2640165612564 is 4652165610462.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2640165612569) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 110006900512 + ... + 110006900535.

Almost surely, 2^{2640165612564} is an apocalyptic number.

It is an amenable number.

2640165612564 is an abundant number, since it is smaller than the sum of its proper divisors (3520220816780).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2640165612564 is a wasteful number, since it uses less digits than its factorization.

2640165612564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220013801054 (or 220013801052 counting only the distinct ones).

The product of its (nonzero) digits is 2073600, while the sum is 48.

The spelling of 2640165612564 in words is "two trillion, six hundred forty billion, one hundred sixty-five million, six hundred twelve thousand, five hundred sixty-four".