25937746721 has 2 divisors, whose sum is σ = 25937746722. Its totient is φ = 25937746720.

The previous prime is 25937746669. The next prime is 25937746789. The reversal of 25937746721 is 12764773952.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16968709696 + 8969037025 = 130264^2 + 94705^2 .

It is a cyclic number.

It is not a de Polignac number, because 25937746721 - 2⁶ = 25937746657 is a prime.

It is not a weakly prime, because it can be changed into another prime (25931746721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12968873360 + 12968873361.

It is an arithmetic number, because the mean of its divisors is an integer number (12968873361).

Almost surely, 2^25937746721 is an apocalyptic number.

It is an amenable number.

25937746721 is a deficient number, since it is larger than the sum of its proper divisors (1).

25937746721 is an equidigital number, since it uses as much as digits as its factorization.

25937746721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4445280, while the sum is 53.

The spelling of 25937746721 in words is "twenty-five billion, nine hundred thirty-seven million, seven hundred forty-six thousand, seven hundred twenty-one".