25707997751 has 2 divisors, whose sum is σ = 25707997752. Its totient is φ = 25707997750.

The previous prime is 25707997699. The next prime is 25707997831. The reversal of 25707997751 is 15779970752.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25707997751 - 2⁶ = 25707997687 is a prime.

It is a super-2 number, since 2×25707997751² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25707990751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12853998875 + 12853998876.

It is an arithmetic number, because the mean of its divisors is an integer number (12853998876).

Almost surely, 2^25707997751 is an apocalyptic number.

25707997751 is a deficient number, since it is larger than the sum of its proper divisors (1).

25707997751 is an equidigital number, since it uses as much as digits as its factorization.

25707997751 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9724050, while the sum is 59.

The spelling of 25707997751 in words is "twenty-five billion, seven hundred seven million, nine hundred ninety-seven thousand, seven hundred fifty-one".