681656965 has 16 divisors (see below), whose sum is σ = 892866240. Its totient is φ = 495464320.

The previous prime is 681656917. The next prime is 681656981. The reversal of 681656965 is 569656186.

It is not a de Polignac number, because 681656965 - 2⁹ = 681656453 is a prime.

It is a super-2 number, since 2×681656965² = 929312435866022450, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 159537 + ... + 163753.

It is an arithmetic number, because the mean of its divisors is an integer number (55804140).

Almost surely, 2^681656965 is an apocalyptic number.

It is an amenable number.

681656965 is a deficient number, since it is larger than the sum of its proper divisors (211209275).

681656965 is a wasteful number, since it uses less digits than its factorization.

681656965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7172.

The product of its digits is 2332800, while the sum is 52.

The square root of 681656965 is about 26108.5611438087. The cubic root of 681656965 is about 880.0796092752.

The spelling of 681656965 in words is "six hundred eighty-one million, six hundred fifty-six thousand, nine hundred sixty-five".