166263645 has 16 divisors (see below), whose sum is σ = 266478912. Its totient is φ = 88521600.

The previous prime is 166263589. The next prime is 166263667. The reversal of 166263645 is 546362661.

It is not a de Polignac number, because 166263645 - 2¹⁴ = 166247261 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 207 + ... + 18236.

It is an arithmetic number, because the mean of its divisors is an integer number (16654932).

Almost surely, 2^166263645 is an apocalyptic number.

166263645 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

166263645 is a deficient number, since it is larger than the sum of its proper divisors (100215267).

166263645 is a wasteful number, since it uses less digits than its factorization.

166263645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19052.

The product of its digits is 155520, while the sum is 39.

The square root of 166263645 is about 12894.3260777754. The cubic root of 166263645 is about 549.8772673801.

The spelling of 166263645 in words is "one hundred sixty-six million, two hundred sixty-three thousand, six hundred forty-five".