681965963 has 8 divisors (see below), whose sum is σ = 779826432. Its totient is φ = 584214696.

The previous prime is 681965953. The next prime is 681966017. The reversal of 681965963 is 369569186.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 681965963 - 2⁶ = 681965899 is a prime.

It is not an unprimeable number, because it can be changed into a prime (681965953) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13445 + ... + 39302.

It is an arithmetic number, because the mean of its divisors is an integer number (97478304).

Almost surely, 2^681965963 is an apocalyptic number.

681965963 is a deficient number, since it is larger than the sum of its proper divisors (97860469).

681965963 is a wasteful number, since it uses less digits than its factorization.

681965963 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54601.

The product of its digits is 2099520, while the sum is 53.

The square root of 681965963 is about 26114.4780342246. The cubic root of 681965963 is about 880.2125704626.

The spelling of 681965963 in words is "six hundred eighty-one million, nine hundred sixty-five thousand, nine hundred sixty-three".