66993946 has 8 divisors (see below), whose sum is σ = 100586304. Its totient is φ = 33465180.

The previous prime is 66993937. The next prime is 66994003. The reversal of 66993946 is 64939966.

It is a happy number.

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

It is a junction number, because it is equal to n+sod(n) for n = 66993893 and 66993902.

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, 13170 + ... + 17533.

It is an arithmetic number, because the mean of its divisors is an integer number (12573288).

Almost surely, 2^66993946 is an apocalyptic number.

66993946 is a deficient number, since it is larger than the sum of its proper divisors (33592358).

66993946 is a wasteful number, since it uses less digits than its factorization.

66993946 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31796.

The product of its digits is 1889568, while the sum is 52.

The square root of 66993946 is about 8184.9829566102. The cubic root of 66993946 is about 406.1425765357.

The spelling of 66993946 in words is "sixty-six million, nine hundred ninety-three thousand, nine hundred forty-six".