166420042 has 16 divisors (see below), whose sum is σ = 262481472. Its totient is φ = 78981760.

The previous prime is 166420003. The next prime is 166420073. The reversal of 166420042 is 240024661.

It is a junction number, because it is equal to n+sod(n) for n = 166419989 and 166420016.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7783 + ... + 19834.

It is an arithmetic number, because the mean of its divisors is an integer number (16405092).

Almost surely, 2^166420042 is an apocalyptic number.

166420042 is a deficient number, since it is larger than the sum of its proper divisors (96061430).

166420042 is a wasteful number, since it uses less digits than its factorization.

166420042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27773.

The product of its (nonzero) digits is 2304, while the sum is 25.

The square root of 166420042 is about 12900.3892189344. The cubic root of 166420042 is about 550.0496285795.

The spelling of 166420042 in words is "one hundred sixty-six million, four hundred twenty thousand, forty-two".