25666070557 has 2 divisors, whose sum is σ = 25666070558. Its totient is φ = 25666070556.

The previous prime is 25666070531. The next prime is 25666070579. The reversal of 25666070557 is 75507066652.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23660284761 + 2005785796 = 153819^2 + 44786^2 .

It is a cyclic number.

It is not a de Polignac number, because 25666070557 - 2⁷ = 25666070429 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 25666070557.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25666970557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12833035278 + 12833035279.

It is an arithmetic number, because the mean of its divisors is an integer number (12833035279).

Almost surely, 2^25666070557 is an apocalyptic number.

It is an amenable number.

25666070557 is a deficient number, since it is larger than the sum of its proper divisors (1).

25666070557 is an equidigital number, since it uses as much as digits as its factorization.

25666070557 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2646000, while the sum is 49.

The spelling of 25666070557 in words is "twenty-five billion, six hundred sixty-six million, seventy thousand, five hundred fifty-seven".