25670055557 has 2 divisors, whose sum is σ = 25670055558. Its totient is φ = 25670055556.

The previous prime is 25670055553. The next prime is 25670055571. The reversal of 25670055557 is 75555007652.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18343722721 + 7326332836 = 135439^2 + 85594^2 .

It is a cyclic number.

It is not a de Polignac number, because 25670055557 - 2² = 25670055553 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25670055553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12835027778 + 12835027779.

It is an arithmetic number, because the mean of its divisors is an integer number (12835027779).

Almost surely, 2^25670055557 is an apocalyptic number.

It is an amenable number.

25670055557 is a deficient number, since it is larger than the sum of its proper divisors (1).

25670055557 is an equidigital number, since it uses as much as digits as its factorization.

25670055557 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1837500, while the sum is 47.

The spelling of 25670055557 in words is "twenty-five billion, six hundred seventy million, fifty-five thousand, five hundred fifty-seven".