681755025 has 24 divisors (see below), whose sum is σ = 1288193344. Its totient is φ = 311659200.

The previous prime is 681755023. The next prime is 681755033. The reversal of 681755025 is 520557186.

It is not a de Polignac number, because 681755025 - 2¹ = 681755023 is a prime.

It is a super-2 number, since 2×681755025² = 929579828225501250, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (681755021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 648766 + ... + 649815.

Almost surely, 2^681755025 is an apocalyptic number.

It is an amenable number.

681755025 is a deficient number, since it is larger than the sum of its proper divisors (606438319).

681755025 is a wasteful number, since it uses less digits than its factorization.

681755025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1298601 (or 1298596 counting only the distinct ones).

The product of its (nonzero) digits is 84000, while the sum is 39.

The square root of 681755025 is about 26110.4390043523. The cubic root of 681755025 is about 880.1218086379.

The spelling of 681755025 in words is "six hundred eighty-one million, seven hundred fifty-five thousand, twenty-five".