25097514561 has 72 divisors (see below), whose sum is σ = 43816853184. Its totient is φ = 13558466880.

The previous prime is 25097514557. The next prime is 25097514619. The reversal of 25097514561 is 16541579052.

It is a happy number.

25097514561 is a `hidden beast` number, since 2 + 5 + 0 + 9 + 75 + 14 + 561 = 666.

It is not a de Polignac number, because 25097514561 - 2² = 25097514557 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25097514061) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 15714615 + ... + 15716211.

Almost surely, 2^25097514561 is an apocalyptic number.

25097514561 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

25097514561 is a deficient number, since it is larger than the sum of its proper divisors (18719338623).

25097514561 is a wasteful number, since it uses less digits than its factorization.

25097514561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2339 (or 2317 counting only the distinct ones).

The product of its (nonzero) digits is 378000, while the sum is 45.

The spelling of 25097514561 in words is "twenty-five billion, ninety-seven million, five hundred fourteen thousand, five hundred sixty-one".