25121442461 has 2 divisors, whose sum is σ = 25121442462. Its totient is φ = 25121442460.

The previous prime is 25121442457. The next prime is 25121442523. The reversal of 25121442461 is 16424412152.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14039880100 + 11081562361 = 118490^2 + 105269^2 .

It is a cyclic number.

It is not a de Polignac number, because 25121442461 - 2² = 25121442457 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25121442761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12560721230 + 12560721231.

It is an arithmetic number, because the mean of its divisors is an integer number (12560721231).

Almost surely, 2^25121442461 is an apocalyptic number.

It is an amenable number.

25121442461 is a deficient number, since it is larger than the sum of its proper divisors (1).

25121442461 is an equidigital number, since it uses as much as digits as its factorization.

25121442461 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15360, while the sum is 32.

The spelling of 25121442461 in words is "twenty-five billion, one hundred twenty-one million, four hundred forty-two thousand, four hundred sixty-one".