66773643 has 4 divisors (see below), whose sum is σ = 89031528. Its totient is φ = 44515760.

The previous prime is 66773627. The next prime is 66773647. The reversal of 66773643 is 34637766.

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

It is a cyclic number.

It is not a de Polignac number, because 66773643 - 2⁴ = 66773627 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66773595 and 66773604.

It is not an unprimeable number, because it can be changed into a prime (66773647) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11128938 + ... + 11128943.

It is an arithmetic number, because the mean of its divisors is an integer number (22257882).

Almost surely, 2^66773643 is an apocalyptic number.

66773643 is a deficient number, since it is larger than the sum of its proper divisors (22257885).

66773643 is a wasteful number, since it uses less digits than its factorization.

66773643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22257884.

The product of its digits is 381024, while the sum is 42.

The square root of 66773643 is about 8171.5141191826. The cubic root of 66773643 is about 405.6969010237.

The spelling of 66773643 in words is "sixty-six million, seven hundred seventy-three thousand, six hundred forty-three".