206171664 has 40 divisors (see below), whose sum is σ = 537337632. Its totient is φ = 68113920.

The previous prime is 206171653. The next prime is 206171723. The reversal of 206171664 is 466171602.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13582 + ... + 24429.

Almost surely, 2^206171664 is an apocalyptic number.

206171664 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

206171664 is an abundant number, since it is smaller than the sum of its proper divisors (331165968).

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

206171664 is a wasteful number, since it uses less digits than its factorization.

206171664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38135 (or 38129 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 33.

The square root of 206171664 is about 14358.6790478790. The cubic root of 206171664 is about 590.7580641711.

The spelling of 206171664 in words is "two hundred six million, one hundred seventy-one thousand, six hundred sixty-four".