2500508661 has 24 divisors (see below), whose sum is σ = 4082467680. Its totient is φ = 1353657312.

The previous prime is 2500508657. The next prime is 2500508663. The reversal of 2500508661 is 1668050052.

It is not a de Polignac number, because 2500508661 - 2² = 2500508657 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2500508663) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 444846 + ... + 450431.

It is an arithmetic number, because the mean of its divisors is an integer number (170102820).

Almost surely, 2^2500508661 is an apocalyptic number.

2500508661 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2500508661 is a deficient number, since it is larger than the sum of its proper divisors (1581959019).

2500508661 is a wasteful number, since it uses less digits than its factorization.

2500508661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 895313 (or 895306 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 33.

The square root of 2500508661 is about 50005.0863512903. The cubic root of 2500508661 is about 1357.3008499473.

The spelling of 2500508661 in words is "two billion, five hundred million, five hundred eight thousand, six hundred sixty-one".