25087999997 has 2 divisors, whose sum is σ = 25087999998. Its totient is φ = 25087999996.

The previous prime is 25087999891. The next prime is 25088000027. The reversal of 25087999997 is 79999978052.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24532643641 + 555356356 = 156629^2 + 23566^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25087999997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25087999697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12543999998 + 12543999999.

It is an arithmetic number, because the mean of its divisors is an integer number (12543999999).

Almost surely, 2^25087999997 is an apocalyptic number.

It is an amenable number.

25087999997 is a deficient number, since it is larger than the sum of its proper divisors (1).

25087999997 is an equidigital number, since it uses as much as digits as its factorization.

25087999997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 231472080, while the sum is 74.

The spelling of 25087999997 in words is "twenty-five billion, eighty-seven million, nine hundred ninety-nine thousand, nine hundred ninety-seven".