25477729961 has 2 divisors, whose sum is σ = 25477729962. Its totient is φ = 25477729960.

The previous prime is 25477729909. The next prime is 25477729997. The reversal of 25477729961 is 16992777452.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24753043561 + 724686400 = 157331^2 + 26920^2 .

It is a cyclic number.

It is not a de Polignac number, because 25477729961 - 2⁶ = 25477729897 is a prime.

It is a super-2 number, since 2×25477729961² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 25477729961.

It is not a weakly prime, because it can be changed into another prime (25477719961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12738864980 + 12738864981.

It is an arithmetic number, because the mean of its divisors is an integer number (12738864981).

Almost surely, 2^25477729961 is an apocalyptic number.

It is an amenable number.

25477729961 is a deficient number, since it is larger than the sum of its proper divisors (1).

25477729961 is an equidigital number, since it uses as much as digits as its factorization.

25477729961 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13335840, while the sum is 59.

The spelling of 25477729961 in words is "twenty-five billion, four hundred seventy-seven million, seven hundred twenty-nine thousand, nine hundred sixty-one".