25651621567 has 24 divisors (see below), whose sum is σ = 30585185280. Its totient is φ = 21324494880.

The previous prime is 25651621561. The next prime is 25651621637. The reversal of 25651621567 is 76512615652.

It is not a de Polignac number, because 25651621567 - 2³ = 25651621559 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25651621561) 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, 134434 + ... + 263392.

It is an arithmetic number, because the mean of its divisors is an integer number (1274382720).

Almost surely, 2^25651621567 is an apocalyptic number.

25651621567 is a deficient number, since it is larger than the sum of its proper divisors (4933563713).

25651621567 is a wasteful number, since it uses less digits than its factorization.

25651621567 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129103 (or 129090 counting only the distinct ones).

The product of its digits is 756000, while the sum is 46.

The spelling of 25651621567 in words is "twenty-five billion, six hundred fifty-one million, six hundred twenty-one thousand, five hundred sixty-seven".