66709942 has 16 divisors (see below), whose sum is σ = 110270160. Its totient is φ = 30072672.

The previous prime is 66709939. The next prime is 66709949. The reversal of 66709942 is 24990766.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66709949) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28717 + ... + 30952.

It is an arithmetic number, because the mean of its divisors is an integer number (6891885).

Almost surely, 2^66709942 is an apocalyptic number.

66709942 is a deficient number, since it is larger than the sum of its proper divisors (43560218).

66709942 is a wasteful number, since it uses less digits than its factorization.

66709942 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59727.

The product of its (nonzero) digits is 163296, while the sum is 43.

The square root of 66709942 is about 8167.6154414860. The cubic root of 66709942 is about 405.5678505005.

The spelling of 66709942 in words is "sixty-six million, seven hundred nine thousand, nine hundred forty-two".