25620591505 has 4 divisors (see below), whose sum is σ = 30744709812. Its totient is φ = 20496473200.

The previous prime is 25620591463. The next prime is 25620591551. The reversal of 25620591505 is 50519502652.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6640294144 + 18980297361 = 81488^2 + 137769^2 .

It is not a de Polignac number, because 25620591505 - 2⁷ = 25620591377 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2562059146 + ... + 2562059155.

It is an arithmetic number, because the mean of its divisors is an integer number (7686177453).

Almost surely, 2^25620591505 is an apocalyptic number.

It is an amenable number.

25620591505 is a deficient number, since it is larger than the sum of its proper divisors (5124118307).

25620591505 is an equidigital number, since it uses as much as digits as its factorization.

25620591505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5124118306.

The product of its (nonzero) digits is 135000, while the sum is 40.

The spelling of 25620591505 in words is "twenty-five billion, six hundred twenty million, five hundred ninety-one thousand, five hundred five".