66740823 has 6 divisors (see below), whose sum is σ = 96403424. Its totient is φ = 44493876.

The previous prime is 66740813. The next prime is 66740831. The reversal of 66740823 is 32804766.

It is not a de Polignac number, because 66740823 - 2⁸ = 66740567 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66740813) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3707815 + ... + 3707832.

Almost surely, 2^66740823 is an apocalyptic number.

66740823 is a deficient number, since it is larger than the sum of its proper divisors (29662601).

66740823 is a wasteful number, since it uses less digits than its factorization.

66740823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7415653 (or 7415650 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 36.

The square root of 66740823 is about 8169.5056766000. The cubic root of 66740823 is about 405.6304219272.

The spelling of 66740823 in words is "sixty-six million, seven hundred forty thousand, eight hundred twenty-three".