166861312 has 20 divisors (see below), whose sum is σ = 333397746. Its totient is φ = 83430400.

The previous prime is 166861217. The next prime is 166861333. The reversal of 166861312 is 213168661.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 164249856 + 2611456 = 12816^2 + 1616^2 .

It is a super-2 number, since 2×166861312² = 55685394884722688, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 162439 + ... + 163462.

Almost surely, 2^166861312 is an apocalyptic number.

It is an amenable number.

166861312 is a deficient number, since it is larger than the sum of its proper divisors (166536434).

166861312 is an frugal number, since it uses more digits than its factorization.

166861312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 325919 (or 325903 counting only the distinct ones).

The product of its digits is 10368, while the sum is 34.

The square root of 166861312 is about 12917.4808689620. The cubic root of 166861312 is about 550.5353597135.

The spelling of 166861312 in words is "one hundred sixty-six million, eight hundred sixty-one thousand, three hundred twelve".