25021000681 has 2 divisors, whose sum is σ = 25021000682. Its totient is φ = 25021000680.

The previous prime is 25021000619. The next prime is 25021000721. The reversal of 25021000681 is 18600012052.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17191405456 + 7829595225 = 131116^2 + 88485^2 .

It is a cyclic number.

It is not a de Polignac number, because 25021000681 - 2¹³ = 25020992489 is a prime.

It is a super-2 number, since 2×25021000681² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (25021000601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12510500340 + 12510500341.

It is an arithmetic number, because the mean of its divisors is an integer number (12510500341).

Almost surely, 2^25021000681 is an apocalyptic number.

It is an amenable number.

25021000681 is a deficient number, since it is larger than the sum of its proper divisors (1).

25021000681 is an equidigital number, since it uses as much as digits as its factorization.

25021000681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 960, while the sum is 25.

The spelling of 25021000681 in words is "twenty-five billion, twenty-one million, six hundred eighty-one", and thus it is an aban number.