25021294861 has 2 divisors, whose sum is σ = 25021294862. Its totient is φ = 25021294860.

The previous prime is 25021294843. The next prime is 25021294867. The reversal of 25021294861 is 16849212052.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24619492836 + 401802025 = 156906^2 + 20045^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25021294861 is a prime.

It is a super-2 number, since 2×25021294861² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25021294867) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12510647430 + 12510647431.

It is an arithmetic number, because the mean of its divisors is an integer number (12510647431).

Almost surely, 2^25021294861 is an apocalyptic number.

It is an amenable number.

25021294861 is a deficient number, since it is larger than the sum of its proper divisors (1).

25021294861 is an equidigital number, since it uses as much as digits as its factorization.

25021294861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 69120, while the sum is 40.

The spelling of 25021294861 in words is "twenty-five billion, twenty-one million, two hundred ninety-four thousand, eight hundred sixty-one".