25461575987 has 2 divisors, whose sum is σ = 25461575988. Its totient is φ = 25461575986.

The previous prime is 25461575983. The next prime is 25461576029. The reversal of 25461575987 is 78957516452.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25461575987 - 2² = 25461575983 is a prime.

It is not a weakly prime, because it can be changed into another prime (25461575983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12730787993 + 12730787994.

It is an arithmetic number, because the mean of its divisors is an integer number (12730787994).

Almost surely, 2^25461575987 is an apocalyptic number.

25461575987 is a deficient number, since it is larger than the sum of its proper divisors (1).

25461575987 is an equidigital number, since it uses as much as digits as its factorization.

25461575987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21168000, while the sum is 59.

The spelling of 25461575987 in words is "twenty-five billion, four hundred sixty-one million, five hundred seventy-five thousand, nine hundred eighty-seven".