25740034721 has 2 divisors, whose sum is σ = 25740034722. Its totient is φ = 25740034720.

The previous prime is 25740034693. The next prime is 25740034759. The reversal of 25740034721 is 12743004752.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20521995025 + 5218039696 = 143255^2 + 72236^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25740034721 is a prime.

It is not a weakly prime, because it can be changed into another prime (25740034121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12870017360 + 12870017361.

It is an arithmetic number, because the mean of its divisors is an integer number (12870017361).

Almost surely, 2^25740034721 is an apocalyptic number.

It is an amenable number.

25740034721 is a deficient number, since it is larger than the sum of its proper divisors (1).

25740034721 is an equidigital number, since it uses as much as digits as its factorization.

25740034721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 47040, while the sum is 35.

The spelling of 25740034721 in words is "twenty-five billion, seven hundred forty million, thirty-four thousand, seven hundred twenty-one".