25507780751 has 2 divisors, whose sum is σ = 25507780752. Its totient is φ = 25507780750.

The previous prime is 25507780657. The next prime is 25507780787. The reversal of 25507780751 is 15708770552.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25507780751 is a prime.

It is a super-2 number, since 2×25507780751² (a number of 22 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 25507780696 and 25507780705.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25507783751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12753890375 + 12753890376.

It is an arithmetic number, because the mean of its divisors is an integer number (12753890376).

Almost surely, 2^25507780751 is an apocalyptic number.

25507780751 is a deficient number, since it is larger than the sum of its proper divisors (1).

25507780751 is an equidigital number, since it uses as much as digits as its factorization.

25507780751 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 686000, while the sum is 47.

The spelling of 25507780751 in words is "twenty-five billion, five hundred seven million, seven hundred eighty thousand, seven hundred fifty-one".