2520606665 has 32 divisors (see below), whose sum is σ = 3127662720. Its totient is φ = 1949359104.

The previous prime is 2520606631. The next prime is 2520606667. The reversal of 2520606665 is 5666060252.

It is not a de Polignac number, because 2520606665 - 2¹² = 2520602569 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2520606667) 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, 7479377 + ... + 7479713.

It is an arithmetic number, because the mean of its divisors is an integer number (97739460).

Almost surely, 2^2520606665 is an apocalyptic number.

It is an amenable number.

2520606665 is a deficient number, since it is larger than the sum of its proper divisors (607056055).

2520606665 is a wasteful number, since it uses less digits than its factorization.

2520606665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 761.

The product of its (nonzero) digits is 129600, while the sum is 38.

The square root of 2520606665 is about 50205.6437564543. The cubic root of 2520606665 is about 1360.9276156072.

The spelling of 2520606665 in words is "two billion, five hundred twenty million, six hundred six thousand, six hundred sixty-five".