25575501087 has 20 divisors (see below), whose sum is σ = 38218916736. Its totient is φ = 17044292160.

The previous prime is 25575501037. The next prime is 25575501113. The reversal of 25575501087 is 78010557552.

25575501087 is a `hidden beast` number, since 2 + 5 + 5 + 7 + 550 + 10 + 87 = 666.

It is not a de Polignac number, because 25575501087 - 2⁷ = 25575500959 is a prime.

It is a super-2 number, since 2×25575501087² (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 (25575501037) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 180162 + ... + 289152.

Almost surely, 2^25575501087 is an apocalyptic number.

25575501087 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

25575501087 is a deficient number, since it is larger than the sum of its proper divisors (12643415649).

25575501087 is a wasteful number, since it uses less digits than its factorization.

25575501087 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111900 (or 111891 counting only the distinct ones).

The product of its (nonzero) digits is 490000, while the sum is 45.

The spelling of 25575501087 in words is "twenty-five billion, five hundred seventy-five million, five hundred one thousand, eighty-seven".