25274433721 has 2 divisors, whose sum is σ = 25274433722. Its totient is φ = 25274433720.

The previous prime is 25274433697. The next prime is 25274433731. The reversal of 25274433721 is 12733447252.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25269871225 + 4562496 = 158965^2 + 2136^2 .

It is a cyclic number.

It is not a de Polignac number, because 25274433721 - 2¹³ = 25274425529 is a prime.

It is not a weakly prime, because it can be changed into another prime (25274433731) 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, 12637216860 + 12637216861.

It is an arithmetic number, because the mean of its divisors is an integer number (12637216861).

Almost surely, 2^25274433721 is an apocalyptic number.

It is an amenable number.

25274433721 is a deficient number, since it is larger than the sum of its proper divisors (1).

25274433721 is an equidigital number, since it uses as much as digits as its factorization.

25274433721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 282240, while the sum is 40.

The spelling of 25274433721 in words is "twenty-five billion, two hundred seventy-four million, four hundred thirty-three thousand, seven hundred twenty-one".