25567604993 has 6 divisors (see below), whose sum is σ = 29741907906. Its totient is φ = 21915089952.

The previous prime is 25567604989. The next prime is 25567605001. The reversal of 25567604993 is 39940676552.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 14658429184 + 10909175809 = 121072^2 + 104447^2 .

It is not a de Polignac number, because 25567604993 - 2² = 25567604989 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25567606993) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 260893880 + ... + 260893977.

It is an arithmetic number, because the mean of its divisors is an integer number (4956984651).

Almost surely, 2^25567604993 is an apocalyptic number.

It is an amenable number.

25567604993 is a deficient number, since it is larger than the sum of its proper divisors (4174302913).

25567604993 is an equidigital number, since it uses as much as digits as its factorization.

25567604993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 521787871 (or 521787864 counting only the distinct ones).

The product of its (nonzero) digits is 12247200, while the sum is 56.

The spelling of 25567604993 in words is "twenty-five billion, five hundred sixty-seven million, six hundred four thousand, nine hundred ninety-three".