25400390497 has 2 divisors, whose sum is σ = 25400390498. Its totient is φ = 25400390496.

The previous prime is 25400390471. The next prime is 25400390567. The reversal of 25400390497 is 79409300452.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15536126736 + 9864263761 = 124644^2 + 99319^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25400390497 is a prime.

It is not a weakly prime, because it can be changed into another prime (25400390467) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12700195248 + 12700195249.

It is an arithmetic number, because the mean of its divisors is an integer number (12700195249).

Almost surely, 2^25400390497 is an apocalyptic number.

It is an amenable number.

25400390497 is a deficient number, since it is larger than the sum of its proper divisors (1).

25400390497 is an equidigital number, since it uses as much as digits as its factorization.

25400390497 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 272160, while the sum is 43.

The spelling of 25400390497 in words is "twenty-five billion, four hundred million, three hundred ninety thousand, four hundred ninety-seven".