66697942 has 8 divisors (see below), whose sum is σ = 105312600. Its totient is φ = 31593744.

The previous prime is 66697937. The next prime is 66697951. The reversal of 66697942 is 24979666.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 877567 + ... + 877642.

It is an arithmetic number, because the mean of its divisors is an integer number (13164075).

Almost surely, 2^66697942 is an apocalyptic number.

66697942 is a deficient number, since it is larger than the sum of its proper divisors (38614658).

66697942 is a wasteful number, since it uses less digits than its factorization.

66697942 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1755230.

The product of its digits is 979776, while the sum is 49.

The square root of 66697942 is about 8166.8807999138. The cubic root of 66697942 is about 405.5435307569.

The spelling of 66697942 in words is "sixty-six million, six hundred ninety-seven thousand, nine hundred forty-two".