25208190977 has 2 divisors, whose sum is σ = 25208190978. Its totient is φ = 25208190976.

The previous prime is 25208190961. The next prime is 25208191067. The reversal of 25208190977 is 77909180252.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16393985521 + 8814205456 = 128039^2 + 93884^2 .

It is a cyclic number.

It is not a de Polignac number, because 25208190977 - 2⁴ = 25208190961 is a prime.

It is not a weakly prime, because it can be changed into another prime (25208190677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12604095488 + 12604095489.

It is an arithmetic number, because the mean of its divisors is an integer number (12604095489).

Almost surely, 2^25208190977 is an apocalyptic number.

It is an amenable number.

25208190977 is a deficient number, since it is larger than the sum of its proper divisors (1).

25208190977 is an equidigital number, since it uses as much as digits as its factorization.

25208190977 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 635040, while the sum is 50.

The spelling of 25208190977 in words is "twenty-five billion, two hundred eight million, one hundred ninety thousand, nine hundred seventy-seven".