166626221443 has 16 divisors (see below), whose sum is σ = 184512222720. Its totient is φ = 149197197600.

The previous prime is 166626221407. The next prime is 166626221453. The reversal of 166626221443 is 344122626661.

It is not a de Polignac number, because 166626221443 - 2²¹ = 166624124291 is a prime.

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 166626221443.

It is not an unprimeable number, because it can be changed into a prime (166626221453) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8914998 + ... + 8933668.

It is an arithmetic number, because the mean of its divisors is an integer number (11532013920).

Almost surely, 2^166626221443 is an apocalyptic number.

166626221443 is a deficient number, since it is larger than the sum of its proper divisors (17886001277).

166626221443 is a wasteful number, since it uses less digits than its factorization.

166626221443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30858.

The product of its digits is 497664, while the sum is 43.

The spelling of 166626221443 in words is "one hundred sixty-six billion, six hundred twenty-six million, two hundred twenty-one thousand, four hundred forty-three".