25560129987 has 32 divisors (see below), whose sum is σ = 43285429760. Its totient is φ = 14602744800.

The previous prime is 25560129983. The next prime is 25560130007. The reversal of 25560129987 is 78992106552.

25560129987 is a `hidden beast` number, since 2 + 5 + 5 + 601 + 29 + 9 + 8 + 7 = 666.

It is not a de Polignac number, because 25560129987 - 2² = 25560129983 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25560129983) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1148112 + ... + 1170162.

It is an arithmetic number, because the mean of its divisors is an integer number (1352669680).

Almost surely, 2^25560129987 is an apocalyptic number.

25560129987 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

25560129987 is a deficient number, since it is larger than the sum of its proper divisors (17725299773).

25560129987 is a wasteful number, since it uses less digits than its factorization.

25560129987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28200 (or 28194 counting only the distinct ones).

The product of its (nonzero) digits is 2721600, while the sum is 54.

The spelling of 25560129987 in words is "twenty-five billion, five hundred sixty million, one hundred twenty-nine thousand, nine hundred eighty-seven".