25577612477 has 2 divisors, whose sum is σ = 25577612478. Its totient is φ = 25577612476.

The previous prime is 25577612419. The next prime is 25577612479. The reversal of 25577612477 is 77421677552.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25152056836 + 425555641 = 158594^2 + 20629^2 .

It is a cyclic number.

It is not a de Polignac number, because 25577612477 - 2²⁸ = 25309177021 is a prime.

Together with 25577612479, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25577612479) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12788806238 + 12788806239.

It is an arithmetic number, because the mean of its divisors is an integer number (12788806239).

Almost surely, 2^25577612477 is an apocalyptic number.

It is an amenable number.

25577612477 is a deficient number, since it is larger than the sum of its proper divisors (1).

25577612477 is an equidigital number, since it uses as much as digits as its factorization.

25577612477 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5762400, while the sum is 53.

The spelling of 25577612477 in words is "twenty-five billion, five hundred seventy-seven million, six hundred twelve thousand, four hundred seventy-seven".