660707690 has 8 divisors (see below), whose sum is σ = 1189273860. Its totient is φ = 264283072.

The previous prime is 660707659. The next prime is 660707701. The reversal of 660707690 is 96707066.

660707690 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 616975921 + 43731769 = 24839^2 + 6613^2 .

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

It is a super-2 number, since 2×660707690² = 873069303250272200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33035375 + ... + 33035394.

Almost surely, 2^660707690 is an apocalyptic number.

660707690 is a deficient number, since it is larger than the sum of its proper divisors (528566170).

660707690 is a wasteful number, since it uses less digits than its factorization.

660707690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66070776.

The product of its (nonzero) digits is 95256, while the sum is 41.

The square root of 660707690 is about 25704.2348650957. The cubic root of 660707690 is about 870.9698481119.

The spelling of 660707690 in words is "six hundred sixty million, seven hundred seven thousand, six hundred ninety".