660166705 has 16 divisors (see below), whose sum is σ = 878390208. Its totient is φ = 472248000.

The previous prime is 660166699. The next prime is 660166709. The reversal of 660166705 is 507661066.

It is a happy number.

It is not a de Polignac number, because 660166705 - 2¹⁵ = 660133937 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (660166709) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 95031 + ... + 101740.

It is an arithmetic number, because the mean of its divisors is an integer number (54899388).

Almost surely, 2^660166705 is an apocalyptic number.

It is an amenable number.

660166705 is a deficient number, since it is larger than the sum of its proper divisors (218223503).

660166705 is a wasteful number, since it uses less digits than its factorization.

660166705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 196848.

The product of its (nonzero) digits is 45360, while the sum is 37.

The square root of 660166705 is about 25693.7094441422. The cubic root of 660166705 is about 870.7320675778.

The spelling of 660166705 in words is "six hundred sixty million, one hundred sixty-six thousand, seven hundred five".