25409716243 has 2 divisors, whose sum is σ = 25409716244. Its totient is φ = 25409716242.

The previous prime is 25409716193. The next prime is 25409716261. The reversal of 25409716243 is 34261790452.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25409716243 - 2²¹ = 25407619091 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 25409716243.

It is not a weakly prime, because it can be changed into another prime (25409710243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12704858121 + 12704858122.

It is an arithmetic number, because the mean of its divisors is an integer number (12704858122).

Almost surely, 2^25409716243 is an apocalyptic number.

25409716243 is a deficient number, since it is larger than the sum of its proper divisors (1).

25409716243 is an equidigital number, since it uses as much as digits as its factorization.

25409716243 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 362880, while the sum is 43.

The spelling of 25409716243 in words is "twenty-five billion, four hundred nine million, seven hundred sixteen thousand, two hundred forty-three".