2507506561 has 4 divisors (see below), whose sum is σ = 2865721792. Its totient is φ = 2149291332.

The previous prime is 2507506553. The next prime is 2507506567. The reversal of 2507506561 is 1656057052.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2507506561 - 2³ = 2507506553 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2507506561.

It is not an unprimeable number, because it can be changed into a prime (2507506567) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 179107605 + ... + 179107618.

It is an arithmetic number, because the mean of its divisors is an integer number (716430448).

Almost surely, 2^2507506561 is an apocalyptic number.

It is an amenable number.

2507506561 is a deficient number, since it is larger than the sum of its proper divisors (358215231).

2507506561 is an equidigital number, since it uses as much as digits as its factorization.

2507506561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 358215230.

The product of its (nonzero) digits is 63000, while the sum is 37.

The square root of 2507506561 is about 50075.0093459802. The cubic root of 2507506561 is about 1358.5658470710.

The spelling of 2507506561 in words is "two billion, five hundred seven million, five hundred six thousand, five hundred sixty-one".