25260556499 has 2 divisors, whose sum is σ = 25260556500. Its totient is φ = 25260556498.

The previous prime is 25260556427. The next prime is 25260556507. The reversal of 25260556499 is 99465506252.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25260556499 is a prime.

It is a super-2 number, since 2×25260556499² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 25260556499.

It is not a weakly prime, because it can be changed into another prime (25260550499) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12630278249 + 12630278250.

It is an arithmetic number, because the mean of its divisors is an integer number (12630278250).

Almost surely, 2^25260556499 is an apocalyptic number.

25260556499 is a deficient number, since it is larger than the sum of its proper divisors (1).

25260556499 is an equidigital number, since it uses as much as digits as its factorization.

25260556499 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5832000, while the sum is 53.

The spelling of 25260556499 in words is "twenty-five billion, two hundred sixty million, five hundred fifty-six thousand, four hundred ninety-nine".