166312811 has 16 divisors (see below), whose sum is σ = 194558400. Its totient is φ = 142107840.

The previous prime is 166312801. The next prime is 166312823. The reversal of 166312811 is 118213661.

It is not a de Polignac number, because 166312811 - 2¹⁰ = 166311787 is a prime.

It is a super-2 number, since 2×166312811² = 55319902205443442, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166312801) 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, 156221 + ... + 157281.

It is an arithmetic number, because the mean of its divisors is an integer number (12159900).

Almost surely, 2^166312811 is an apocalyptic number.

166312811 is a deficient number, since it is larger than the sum of its proper divisors (28245589).

166312811 is an equidigital number, since it uses as much as digits as its factorization.

166312811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1539 (or 1525 counting only the distinct ones).

The product of its digits is 1728, while the sum is 29.

The square root of 166312811 is about 12896.2324343197. The cubic root of 166312811 is about 549.9314636362.

The spelling of 166312811 in words is "one hundred sixty-six million, three hundred twelve thousand, eight hundred eleven".