25611221625 has 64 divisors (see below), whose sum is σ = 48512894976. Its totient is φ = 11877624000.

The previous prime is 25611221621. The next prime is 25611221639. The reversal of 25611221625 is 52612211652.

It is not a de Polignac number, because 25611221625 - 2² = 25611221621 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (25611221621) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 40099 + ... + 229848.

It is an arithmetic number, because the mean of its divisors is an integer number (758013984).

Almost surely, 2^25611221625 is an apocalyptic number.

25611221625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

25611221625 is a deficient number, since it is larger than the sum of its proper divisors (22901673351).

25611221625 is a wasteful number, since it uses less digits than its factorization.

25611221625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 269999 (or 269989 counting only the distinct ones).

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

The spelling of 25611221625 in words is "twenty-five billion, six hundred eleven million, two hundred twenty-one thousand, six hundred twenty-five".