689370661 has 8 divisors (see below), whose sum is σ = 803931200. Its totient is φ = 590888844.

The previous prime is 689370659. The next prime is 689370677. The reversal of 689370661 is 166073986.

689370661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 689370661 - 2¹ = 689370659 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (689370631) 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, 1004571 + ... + 1005256.

It is an arithmetic number, because the mean of its divisors is an integer number (100491400).

Almost surely, 2^689370661 is an apocalyptic number.

It is an amenable number.

689370661 is a deficient number, since it is larger than the sum of its proper divisors (114560539).

689370661 is an equidigital number, since it uses as much as digits as its factorization.

689370661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2009848 (or 2009834 counting only the distinct ones).

The product of its (nonzero) digits is 326592, while the sum is 46.

The square root of 689370661 is about 26255.8690772178. The cubic root of 689370661 is about 883.3868540334.

The spelling of 689370661 in words is "six hundred eighty-nine million, three hundred seventy thousand, six hundred sixty-one".