681253965 has 48 divisors (see below), whose sum is σ = 1355328000. Its totient is φ = 310093056.

The previous prime is 681253931. The next prime is 681253981. The reversal of 681253965 is 569352186.

It is not a de Polignac number, because 681253965 - 2⁶ = 681253901 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 681253965.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 70761 + ... + 79809.

It is an arithmetic number, because the mean of its divisors is an integer number (28236000).

Almost surely, 2^681253965 is an apocalyptic number.

It is an amenable number.

681253965 is a deficient number, since it is larger than the sum of its proper divisors (674074035).

681253965 is a wasteful number, since it uses less digits than its factorization.

681253965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9306 (or 9303 counting only the distinct ones).

The product of its digits is 388800, while the sum is 45.

The square root of 681253965 is about 26100.8422277903. The cubic root of 681253965 is about 879.9061388355.

The spelling of 681253965 in words is "six hundred eighty-one million, two hundred fifty-three thousand, nine hundred sixty-five".