66573783 has 6 divisors (see below), whose sum is σ = 96162144. Its totient is φ = 44382516.

The previous prime is 66573733. The next prime is 66573797. The reversal of 66573783 is 38737566.

66573783 is a `hidden beast` number, since 6 + 6 + 573 + 78 + 3 = 666.

It is not a de Polignac number, because 66573783 - 2²⁵ = 33019351 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66573733) 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, 3698535 + ... + 3698552.

It is an arithmetic number, because the mean of its divisors is an integer number (16027024).

Almost surely, 2^66573783 is an apocalyptic number.

66573783 is a deficient number, since it is larger than the sum of its proper divisors (29588361).

66573783 is a wasteful number, since it uses less digits than its factorization.

66573783 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7397093 (or 7397090 counting only the distinct ones).

The product of its digits is 635040, while the sum is 45.

The square root of 66573783 is about 8159.2758869890. The cubic root of 66573783 is about 405.2917331072.

It can be divided in two parts, 6657 and 3783, that added together give a triangular number (10440 = T₁₄₄).

The spelling of 66573783 in words is "sixty-six million, five hundred seventy-three thousand, seven hundred eighty-three".