66765814 has 4 divisors (see below), whose sum is σ = 100148724. Its totient is φ = 33382906.

The previous prime is 66765793. The next prime is 66765863. The reversal of 66765814 is 41856766.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16691452 + ... + 16691455.

It is an arithmetic number, because the mean of its divisors is an integer number (25037181).

Almost surely, 2^66765814 is an apocalyptic number.

66765814 is a deficient number, since it is larger than the sum of its proper divisors (33382910).

66765814 is a wasteful number, since it uses less digits than its factorization.

66765814 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33382909.

The product of its digits is 241920, while the sum is 43.

The square root of 66765814 is about 8171.0350629526. The cubic root of 66765814 is about 405.6810448413.

The spelling of 66765814 in words is "sixty-six million, seven hundred sixty-five thousand, eight hundred fourteen".