25603511497 has 2 divisors, whose sum is σ = 25603511498. Its totient is φ = 25603511496.

The previous prime is 25603511477. The next prime is 25603511533. The reversal of 25603511497 is 79411530652.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23622460416 + 1981051081 = 153696^2 + 44509^2 .

It is a cyclic number.

It is not a de Polignac number, because 25603511497 - 2⁷ = 25603511369 is a prime.

It is a super-2 number, since 2×25603511497² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (25603511407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12801755748 + 12801755749.

It is an arithmetic number, because the mean of its divisors is an integer number (12801755749).

Almost surely, 2^25603511497 is an apocalyptic number.

It is an amenable number.

25603511497 is a deficient number, since it is larger than the sum of its proper divisors (1).

25603511497 is an equidigital number, since it uses as much as digits as its factorization.

25603511497 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 226800, while the sum is 43.

The spelling of 25603511497 in words is "twenty-five billion, six hundred three million, five hundred eleven thousand, four hundred ninety-seven".