25699974457 has 2 divisors, whose sum is σ = 25699974458. Its totient is φ = 25699974456.

The previous prime is 25699974401. The next prime is 25699974467. The reversal of 25699974457 is 75447999652.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21159775296 + 4540199161 = 145464^2 + 67381^2 .

It is a cyclic number.

It is not a de Polignac number, because 25699974457 - 2¹⁹ = 25699450169 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 25699974392 and 25699974401.

It is not a weakly prime, because it can be changed into another prime (25699974467) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12849987228 + 12849987229.

It is an arithmetic number, because the mean of its divisors is an integer number (12849987229).

Almost surely, 2^25699974457 is an apocalyptic number.

It is an amenable number.

25699974457 is a deficient number, since it is larger than the sum of its proper divisors (1).

25699974457 is an equidigital number, since it uses as much as digits as its factorization.

25699974457 is an evil number, because the sum of its binary digits is even.

The product of its digits is 171460800, while the sum is 67.

The spelling of 25699974457 in words is "twenty-five billion, six hundred ninety-nine million, nine hundred seventy-four thousand, four hundred fifty-seven".