166163644441 has 2 divisors, whose sum is σ = 166163644442. Its totient is φ = 166163644440.

The previous prime is 166163644397. The next prime is 166163644469. The reversal of 166163644441 is 144446361661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 161620884441 + 4542760000 = 402021^2 + 67400^2 .

It is a cyclic number.

It is not a de Polignac number, because 166163644441 - 2⁷ = 166163644313 is a prime.

It is a super-2 number, since 2×166163644441² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 166163644391 and 166163644400.

It is not a weakly prime, because it can be changed into another prime (166163644541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83081822220 + 83081822221.

It is an arithmetic number, because the mean of its divisors is an integer number (83081822221).

Almost surely, 2^166163644441 is an apocalyptic number.

It is an amenable number.

166163644441 is a deficient number, since it is larger than the sum of its proper divisors (1).

166163644441 is an equidigital number, since it uses as much as digits as its factorization.

166163644441 is an evil number, because the sum of its binary digits is even.

The product of its digits is 995328, while the sum is 46.

The spelling of 166163644441 in words is "one hundred sixty-six billion, one hundred sixty-three million, six hundred forty-four thousand, four hundred forty-one".