681706033 has 4 divisors (see below), whose sum is σ = 681809920. Its totient is φ = 681602148.

The previous prime is 681706031. The next prime is 681706037. The reversal of 681706033 is 330607186.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 681706033 - 2¹ = 681706031 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 681706033.

It is not an unprimeable number, because it can be changed into a prime (681706031) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41385 + ... + 55462.

It is an arithmetic number, because the mean of its divisors is an integer number (170452480).

Almost surely, 2^681706033 is an apocalyptic number.

It is an amenable number.

681706033 is a deficient number, since it is larger than the sum of its proper divisors (103887).

681706033 is an equidigital number, since it uses as much as digits as its factorization.

681706033 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103886.

The product of its (nonzero) digits is 18144, while the sum is 34.

The square root of 681706033 is about 26109.5008186675. The cubic root of 681706033 is about 880.1007258154.

The spelling of 681706033 in words is "six hundred eighty-one million, seven hundred six thousand, thirty-three".