25207605077021 has 2 divisors, whose sum is σ = 25207605077022. Its totient is φ = 25207605077020.

The previous prime is 25207605076961. The next prime is 25207605077041. The reversal of 25207605077021 is 12077050670252.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22738115402500 + 2469489674521 = 4768450^2 + 1571461^2 .

It is a cyclic number.

It is not a de Polignac number, because 25207605077021 - 2¹⁰ = 25207605075997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25207605077041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12603802538510 + 12603802538511.

It is an arithmetic number, because the mean of its divisors is an integer number (12603802538511).

Almost surely, 2^{25207605077021} is an apocalyptic number.

It is an amenable number.

25207605077021 is a deficient number, since it is larger than the sum of its proper divisors (1).

25207605077021 is an equidigital number, since it uses as much as digits as its factorization.

25207605077021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 411600, while the sum is 44.

The spelling of 25207605077021 in words is "twenty-five trillion, two hundred seven billion, six hundred five million, seventy-seven thousand, twenty-one".