166722011 has 4 divisors (see below), whose sum is σ = 166753224. Its totient is φ = 166690800.

The previous prime is 166722007. The next prime is 166722053. The reversal of 166722011 is 110227661.

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

It is a cyclic number.

It is not a de Polignac number, because 166722011 - 2² = 166722007 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166722071) 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, 5345 + ... + 19026.

It is an arithmetic number, because the mean of its divisors is an integer number (41688306).

Almost surely, 2^166722011 is an apocalyptic number.

166722011 is a deficient number, since it is larger than the sum of its proper divisors (31213).

166722011 is an equidigital number, since it uses as much as digits as its factorization.

166722011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31212.

The product of its (nonzero) digits is 1008, while the sum is 26.

The square root of 166722011 is about 12912.0877862567. The cubic root of 166722011 is about 550.3821157286.

Adding to 166722011 its reverse (110227661), we get a palindrome (276949672).

The spelling of 166722011 in words is "one hundred sixty-six million, seven hundred twenty-two thousand, eleven".