166201665 has 64 divisors (see below), whose sum is σ = 314468352. Its totient is φ = 73382400.

The previous prime is 166201631. The next prime is 166201681. The reversal of 166201665 is 566102661.

It is not a de Polignac number, because 166201665 - 2¹¹ = 166199617 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 591325 + ... + 591605.

It is an arithmetic number, because the mean of its divisors is an integer number (4913568).

Almost surely, 2^166201665 is an apocalyptic number.

166201665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

166201665 is a deficient number, since it is larger than the sum of its proper divisors (148266687).

166201665 is a wasteful number, since it uses less digits than its factorization.

166201665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 470.

The product of its (nonzero) digits is 12960, while the sum is 33.

The square root of 166201665 is about 12891.9224710669. The cubic root of 166201665 is about 549.8089308758.

The spelling of 166201665 in words is "one hundred sixty-six million, two hundred one thousand, six hundred sixty-five".