660020042 has 16 divisors (see below), whose sum is σ = 1081944864. Its totient is φ = 299478000.

The previous prime is 660020033. The next prime is 660020057. The reversal of 660020042 is 240020066.

It is a junction number, because it is equal to n+sod(n) for n = 660019996 and 660020023.

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, 13709 + ... + 38832.

It is an arithmetic number, because the mean of its divisors is an integer number (67621554).

Almost surely, 2^660020042 is an apocalyptic number.

660020042 is a deficient number, since it is larger than the sum of its proper divisors (421924822).

660020042 is a wasteful number, since it uses less digits than its factorization.

660020042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53125.

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 660020042 is about 25690.8552212650. The cubic root of 660020042 is about 870.6675820297.

The spelling of 660020042 in words is "six hundred sixty million, twenty thousand, forty-two".