66671783 has 8 divisors (see below), whose sum is σ = 69156480. Its totient is φ = 64199520.

The previous prime is 66671771. The next prime is 66671791. The reversal of 66671783 is 38717666.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66671783 - 2¹⁰ = 66670759 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 (66671723) 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, 8618 + ... + 14408.

It is an arithmetic number, because the mean of its divisors is an integer number (8644560).

Almost surely, 2^66671783 is an apocalyptic number.

66671783 is a deficient number, since it is larger than the sum of its proper divisors (2484697).

66671783 is a wasteful number, since it uses less digits than its factorization.

66671783 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6217.

The product of its digits is 254016, while the sum is 44.

The square root of 66671783 is about 8165.2791134168. The cubic root of 66671783 is about 405.4905056305.

The spelling of 66671783 in words is "sixty-six million, six hundred seventy-one thousand, seven hundred eighty-three".