25225637765 has 16 divisors (see below), whose sum is σ = 32059748160. Its totient is φ = 18988473600.

The previous prime is 25225637761. The next prime is 25225637779. The reversal of 25225637765 is 56773652252.

It is not a de Polignac number, because 25225637765 - 2² = 25225637761 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25225637761) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 307706 + ... + 380964.

It is an arithmetic number, because the mean of its divisors is an integer number (2003734260).

Almost surely, 2^25225637765 is an apocalyptic number.

It is an amenable number.

25225637765 is a deficient number, since it is larger than the sum of its proper divisors (6834110395).

25225637765 is a wasteful number, since it uses less digits than its factorization.

25225637765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77332.

The product of its digits is 5292000, while the sum is 50.

The spelling of 25225637765 in words is "twenty-five billion, two hundred twenty-five million, six hundred thirty-seven thousand, seven hundred sixty-five".