66663794 has 8 divisors (see below), whose sum is σ = 101488368. Its totient is φ = 32834340.

The previous prime is 66663769. The next prime is 66663797. The reversal of 66663794 is 49736666.

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

It is a super-2 number, since 2×66663794² = 8888122860948872, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (66663797) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 248612 + ... + 248879.

It is an arithmetic number, because the mean of its divisors is an integer number (12686046).

Almost surely, 2^66663794 is an apocalyptic number.

66663794 is a deficient number, since it is larger than the sum of its proper divisors (34824574).

66663794 is a wasteful number, since it uses less digits than its factorization.

66663794 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 497560.

The product of its digits is 979776, while the sum is 47.

The square root of 66663794 is about 8164.7898931938. The cubic root of 66663794 is about 405.4743089083.

The spelling of 66663794 in words is "sixty-six million, six hundred sixty-three thousand, seven hundred ninety-four".