25645691904 has 528 divisors, whose sum is σ = 86640568704. Its totient is φ = 6582435840.

The previous prime is 25645691881. The next prime is 25645691917. The reversal of 25645691904 is 40919654652.

It is a super-2 number, since 2×25645691904² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 351310812 + ... + 351310884.

Almost surely, 2^25645691904 is an apocalyptic number.

25645691904 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25645691904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43320284352).

25645691904 is an abundant number, since it is smaller than the sum of its proper divisors (60994876800).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25645691904 is a wasteful number, since it uses less digits than its factorization.

25645691904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182 (or 133 counting only the distinct ones).

The product of its (nonzero) digits is 2332800, while the sum is 51.

The spelling of 25645691904 in words is "twenty-five billion, six hundred forty-five million, six hundred ninety-one thousand, nine hundred four".