66161556733 has 8 divisors (see below), whose sum is σ = 66923895168. Its totient is φ = 65401526064.

The previous prime is 66161556701. The next prime is 66161556763. The reversal of 66161556733 is 33765516166.

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 66161556733 - 2⁵ = 66161556701 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 (66161556763) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 519241 + ... + 633982.

It is an arithmetic number, because the mean of its divisors is an integer number (8365486896).

Almost surely, 2^66161556733 is an apocalyptic number.

It is an amenable number.

66161556733 is a deficient number, since it is larger than the sum of its proper divisors (762338435).

66161556733 is a wasteful number, since it uses less digits than its factorization.

66161556733 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1153883.

The product of its digits is 2041200, while the sum is 49.

The spelling of 66161556733 in words is "sixty-six billion, one hundred sixty-one million, five hundred fifty-six thousand, seven hundred thirty-three".