166313221401 has 32 divisors (see below), whose sum is σ = 230578151040. Its totient is φ = 106501961216.

The previous prime is 166313221357. The next prime is 166313221423. The reversal of 166313221401 is 104122313661.

It is a cyclic number.

It is not a de Polignac number, because 166313221401 - 2⁷ = 166313221273 is a prime.

It is a super-2 number, since 2×166313221401² (a number of 23 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (166313221201) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 39436645 + ... + 39440861.

It is an arithmetic number, because the mean of its divisors is an integer number (7205567220).

Almost surely, 2^166313221401 is an apocalyptic number.

It is an amenable number.

166313221401 is a deficient number, since it is larger than the sum of its proper divisors (64264929639).

166313221401 is a wasteful number, since it uses less digits than its factorization.

166313221401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6473.

The product of its (nonzero) digits is 5184, while the sum is 30.

The spelling of 166313221401 in words is "one hundred sixty-six billion, three hundred thirteen million, two hundred twenty-one thousand, four hundred one".