25497997560 has 256 divisors, whose sum is σ = 98729395200. Its totient is φ = 5732467200.

The previous prime is 25497997513. The next prime is 25497997583. The reversal of 25497997560 is 6579979452.

25497997560 is a `hidden beast` number, since 2 + 5 + 497 + 9 + 97 + 56 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 433515 + ... + 488805.

It is an arithmetic number, because the mean of its divisors is an integer number (385661700).

Almost surely, 2^25497997560 is an apocalyptic number.

25497997560 is a gapful number since it is divisible by the number (20) 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 25497997560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (49364697600).

25497997560 is an abundant number, since it is smaller than the sum of its proper divisors (73231397640).

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

25497997560 is a wasteful number, since it uses less digits than its factorization.

25497997560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55379 (or 55369 counting only the distinct ones).

The product of its (nonzero) digits is 42865200, while the sum is 63.

The spelling of 25497997560 in words is "twenty-five billion, four hundred ninety-seven million, nine hundred ninety-seven thousand, five hundred sixty".