25809318968 has 16 divisors (see below), whose sum is σ = 48773518080. Its totient is φ = 12803047488.

The previous prime is 25809318967. The next prime is 25809319037. The reversal of 25809318968 is 86981390852.

It is a super-2 number, since 2×25809318968² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25809318967) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12700421 + ... + 12702452.

It is an arithmetic number, because the mean of its divisors is an integer number (3048344880).

Almost surely, 2^25809318968 is an apocalyptic number.

It is an amenable number.

25809318968 is a deficient number, since it is larger than the sum of its proper divisors (22964199112).

25809318968 is a wasteful number, since it uses less digits than its factorization.

25809318968 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25403006 (or 25403002 counting only the distinct ones).

The product of its (nonzero) digits is 7464960, while the sum is 59.

The spelling of 25809318968 in words is "twenty-five billion, eight hundred nine million, three hundred eighteen thousand, nine hundred sixty-eight".