25774145861 has 2 divisors, whose sum is σ = 25774145862. Its totient is φ = 25774145860.

The previous prime is 25774145857. The next prime is 25774145899. The reversal of 25774145861 is 16854147752.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16346901025 + 9427244836 = 127855^2 + 97094^2 .

It is a cyclic number.

It is not a de Polignac number, because 25774145861 - 2² = 25774145857 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25774145561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12887072930 + 12887072931.

It is an arithmetic number, because the mean of its divisors is an integer number (12887072931).

Almost surely, 2^25774145861 is an apocalyptic number.

It is an amenable number.

25774145861 is a deficient number, since it is larger than the sum of its proper divisors (1).

25774145861 is an equidigital number, since it uses as much as digits as its factorization.

25774145861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1881600, while the sum is 50.

The spelling of 25774145861 in words is "twenty-five billion, seven hundred seventy-four million, one hundred forty-five thousand, eight hundred sixty-one".