25726417961 has 2 divisors, whose sum is σ = 25726417962. Its totient is φ = 25726417960.

The previous prime is 25726417931. The next prime is 25726417967. The reversal of 25726417961 is 16971462752.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23060244736 + 2666173225 = 151856^2 + 51635^2 .

It is a cyclic number.

It is not a de Polignac number, because 25726417961 - 2²⁶ = 25659309097 is a prime.

It is a super-2 number, since 2×25726417961² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (25726417967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12863208980 + 12863208981.

It is an arithmetic number, because the mean of its divisors is an integer number (12863208981).

Almost surely, 2^25726417961 is an apocalyptic number.

It is an amenable number.

25726417961 is a deficient number, since it is larger than the sum of its proper divisors (1).

25726417961 is an equidigital number, since it uses as much as digits as its factorization.

25726417961 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1270080, while the sum is 50.

The spelling of 25726417961 in words is "twenty-five billion, seven hundred twenty-six million, four hundred seventeen thousand, nine hundred sixty-one".