66799668 has 96 divisors (see below), whose sum is σ = 182640640. Its totient is φ = 18817920.

The previous prime is 66799609. The next prime is 66799703. The reversal of 66799668 is 86699766.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 91521 + ... + 92247.

Almost surely, 2^66799668 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66799668, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (91320320).

66799668 is an abundant number, since it is smaller than the sum of its proper divisors (115840972).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66799668 is a wasteful number, since it uses less digits than its factorization.

66799668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 797 (or 795 counting only the distinct ones).

The product of its digits is 5878656, while the sum is 57.

The square root of 66799668 is about 8173.1063861912. The cubic root of 66799668 is about 405.7496009113.

The spelling of 66799668 in words is "sixty-six million, seven hundred ninety-nine thousand, six hundred sixty-eight".