66775633 has 8 divisors (see below), whose sum is σ = 70423520. Its totient is φ = 63141120.

The previous prime is 66775627. The next prime is 66775637. The reversal of 66775633 is 33657766.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66775633 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66775633.

It is not an unprimeable number, because it can be changed into a prime (66775637) 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, 7918 + ... + 14008.

It is an arithmetic number, because the mean of its divisors is an integer number (8802940).

Almost surely, 2^66775633 is an apocalyptic number.

It is an amenable number.

66775633 is a deficient number, since it is larger than the sum of its proper divisors (3647887).

66775633 is a wasteful number, since it uses less digits than its factorization.

66775633 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6687.

The product of its digits is 476280, while the sum is 43.

The square root of 66775633 is about 8171.6358827349. The cubic root of 66775633 is about 405.7009312007.

The spelling of 66775633 in words is "sixty-six million, seven hundred seventy-five thousand, six hundred thirty-three".