66388386 has 16 divisors (see below), whose sum is σ = 132857568. Its totient is φ = 22116000.

The previous prime is 66388381. The next prime is 66388429. The reversal of 66388386 is 68388366.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (66388381) 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, 15166 + ... + 19046.

It is an arithmetic number, because the mean of its divisors is an integer number (8303598).

Almost surely, 2^66388386 is an apocalyptic number.

66388386 is an abundant number, since it is smaller than the sum of its proper divisors (66469182).

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

66388386 is a wasteful number, since it uses less digits than its factorization.

66388386 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6737.

The product of its digits is 995328, while the sum is 48.

The square root of 66388386 is about 8147.9068477739. The cubic root of 66388386 is about 404.9151597931.

The spelling of 66388386 in words is "sixty-six million, three hundred eighty-eight thousand, three hundred eighty-six".