660717690 has 16 divisors (see below), whose sum is σ = 1585722528. Its totient is φ = 176191376.

The previous prime is 660717689. The next prime is 660717691. The reversal of 660717690 is 96717066.

It is an interprime number because it is at equal distance from previous prime (660717689) and next prime (660717691).

It is a super-2 number, since 2×660717690² = 873095731757872200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (660717691) 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, 11011932 + ... + 11011991.

It is an arithmetic number, because the mean of its divisors is an integer number (99107658).

Almost surely, 2^660717690 is an apocalyptic number.

660717690 is an abundant number, since it is smaller than the sum of its proper divisors (925004838).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

660717690 is a wasteful number, since it uses less digits than its factorization.

660717690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22023933.

The product of its (nonzero) digits is 95256, while the sum is 42.

The square root of 660717690 is about 25704.4293848356. The cubic root of 660717690 is about 870.9742422157.

The spelling of 660717690 in words is "six hundred sixty million, seven hundred seventeen thousand, six hundred ninety".