25620591377 has 2 divisors, whose sum is σ = 25620591378. Its totient is φ = 25620591376.

The previous prime is 25620591371. The next prime is 25620591379. The reversal of 25620591377 is 77319502652.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25152691216 + 467900161 = 158596^2 + 21631^2 .

It is a cyclic number.

It is not a de Polignac number, because 25620591377 - 2⁶ = 25620591313 is a prime.

It is a super-2 number, since 2×25620591377² (a number of 22 digits) contains 22 as substring.

Together with 25620591379, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (25620591371) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12810295688 + 12810295689.

It is an arithmetic number, because the mean of its divisors is an integer number (12810295689).

Almost surely, 2^25620591377 is an apocalyptic number.

It is an amenable number.

25620591377 is a deficient number, since it is larger than the sum of its proper divisors (1).

25620591377 is an equidigital number, since it uses as much as digits as its factorization.

25620591377 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 793800, while the sum is 47.

The spelling of 25620591377 in words is "twenty-five billion, six hundred twenty million, five hundred ninety-one thousand, three hundred seventy-seven".