2640380257665 has 32 divisors (see below), whose sum is σ = 4970127548160. Its totient is φ = 1325367343872.

The previous prime is 2640380257661. The next prime is 2640380257667. The reversal of 2640380257665 is 5667520830462.

2640380257665 is a `hidden beast` number, since 2 + 6 + 4 + 0 + 3 + 8 + 0 + 2 + 576 + 65 = 666.

It is not a de Polignac number, because 2640380257665 - 2² = 2640380257661 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2640380257661) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 575243949 + ... + 575248538.

It is an arithmetic number, because the mean of its divisors is an integer number (155316485880).

Almost surely, 2^{2640380257665} is an apocalyptic number.

It is an amenable number.

2640380257665 is a deficient number, since it is larger than the sum of its proper divisors (2329747290495).

2640380257665 is a wasteful number, since it uses less digits than its factorization.

2640380257665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1150492518 (or 1150492512 counting only the distinct ones).

The product of its (nonzero) digits is 14515200, while the sum is 54.

The spelling of 2640380257665 in words is "two trillion, six hundred forty billion, three hundred eighty million, two hundred fifty-seven thousand, six hundred sixty-five".