2640640020165 has 48 divisors (see below), whose sum is σ = 5250284822016. Its totient is φ = 1202695257600.

The previous prime is 2640640020103. The next prime is 2640640020169. The reversal of 2640640020165 is 5610200460462.

2640640020165 is a `hidden beast` number, since 2 + 6 + 4 + 0 + 640 + 0 + 2 + 0 + 1 + 6 + 5 = 666.

It is not a de Polignac number, because 2640640020165 - 2¹⁵ = 2640639987397 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2640640020169) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 15381396 + ... + 15552125.

It is an arithmetic number, because the mean of its divisors is an integer number (109380933792).

Almost surely, 2^{2640640020165} is an apocalyptic number.

It is an amenable number.

2640640020165 is a deficient number, since it is larger than the sum of its proper divisors (2609644801851).

2640640020165 is a wasteful number, since it uses less digits than its factorization.

2640640020165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30933810 (or 30933807 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 36.

The spelling of 2640640020165 in words is "two trillion, six hundred forty billion, six hundred forty million, twenty thousand, one hundred sixty-five".