166290165291 has 4 divisors (see below), whose sum is σ = 221720220392. Its totient is φ = 110860110192.

The previous prime is 166290165287. The next prime is 166290165337. The reversal of 166290165291 is 192561092661.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 166290165291 - 2² = 166290165287 is a prime.

It is a super-2 number, since 2×166290165291² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 166290165291.

It is not an unprimeable number, because it can be changed into a prime (166290161291) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27715027546 + ... + 27715027551.

It is an arithmetic number, because the mean of its divisors is an integer number (55430055098).

Almost surely, 2^166290165291 is an apocalyptic number.

166290165291 is a deficient number, since it is larger than the sum of its proper divisors (55430055101).

166290165291 is an equidigital number, since it uses as much as digits as its factorization.

166290165291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55430055100.

The product of its (nonzero) digits is 349920, while the sum is 48.

The spelling of 166290165291 in words is "one hundred sixty-six billion, two hundred ninety million, one hundred sixty-five thousand, two hundred ninety-one".