25436701321 has 2 divisors, whose sum is σ = 25436701322. Its totient is φ = 25436701320.

The previous prime is 25436701313. The next prime is 25436701327. The reversal of 25436701321 is 12310763452.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23611702921 + 1824998400 = 153661^2 + 42720^2 .

It is a cyclic number.

It is not a de Polignac number, because 25436701321 - 2³ = 25436701313 is a prime.

It is not a weakly prime, because it can be changed into another prime (25436701327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12718350660 + 12718350661.

It is an arithmetic number, because the mean of its divisors is an integer number (12718350661).

Almost surely, 2^25436701321 is an apocalyptic number.

It is an amenable number.

25436701321 is a deficient number, since it is larger than the sum of its proper divisors (1).

25436701321 is an equidigital number, since it uses as much as digits as its factorization.

25436701321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 30240, while the sum is 34.

The spelling of 25436701321 in words is "twenty-five billion, four hundred thirty-six million, seven hundred one thousand, three hundred twenty-one".