166521942 has 12 divisors (see below), whose sum is σ = 360797580. Its totient is φ = 55507308.

The previous prime is 166521917. The next prime is 166521983. The reversal of 166521942 is 249125661.

It is a junction number, because it is equal to n+sod(n) for n = 166521897 and 166521906.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4625592 + ... + 4625627.

It is an arithmetic number, because the mean of its divisors is an integer number (30066465).

Almost surely, 2^166521942 is an apocalyptic number.

166521942 is an abundant number, since it is smaller than the sum of its proper divisors (194275638).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

166521942 is a wasteful number, since it uses less digits than its factorization.

166521942 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9251227 (or 9251224 counting only the distinct ones).

The product of its digits is 25920, while the sum is 36.

The square root of 166521942 is about 12904.3381077838. The cubic root of 166521942 is about 550.1618719136.

The spelling of 166521942 in words is "one hundred sixty-six million, five hundred twenty-one thousand, nine hundred forty-two".