25461575991 has 64 divisors (see below), whose sum is σ = 40466534400. Its totient is φ = 15787094400.

The previous prime is 25461575987. The next prime is 25461576029. The reversal of 25461575991 is 19957516452.

25461575991 is a `hidden beast` number, since 2 + 5 + 4 + 61 + 575 + 9 + 9 + 1 = 666.

It is not a de Polignac number, because 25461575991 - 2² = 25461575987 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25461575921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 5507661 + ... + 5512281.

It is an arithmetic number, because the mean of its divisors is an integer number (632289600).

Almost surely, 2^25461575991 is an apocalyptic number.

25461575991 is a deficient number, since it is larger than the sum of its proper divisors (15004958409).

25461575991 is a wasteful number, since it uses less digits than its factorization.

25461575991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4917 (or 4911 counting only the distinct ones).

The product of its digits is 3402000, while the sum is 54.

The spelling of 25461575991 in words is "twenty-five billion, four hundred sixty-one million, five hundred seventy-five thousand, nine hundred ninety-one".