166163644442 has 8 divisors (see below), whose sum is σ = 263906964756. Its totient is φ = 78194656192.

The previous prime is 166163644441. The next prime is 166163644469. The reversal of 166163644442 is 244446361661.

It can be written as a sum of positive squares in 2 ways, for example, as 166008168481 + 155475961 = 407441^2 + 12469^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×166163644442² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (166163644441) 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, 2443582973 + ... + 2443583040.

Almost surely, 2^166163644442 is an apocalyptic number.

166163644442 is a deficient number, since it is larger than the sum of its proper divisors (97743320314).

166163644442 is a wasteful number, since it uses less digits than its factorization.

166163644442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4887166032.

The product of its digits is 1990656, while the sum is 47.

The spelling of 166163644442 in words is "one hundred sixty-six billion, one hundred sixty-three million, six hundred forty-four thousand, four hundred forty-two".