66291934583 has 16 divisors (see below), whose sum is σ = 76085001216. Its totient is φ = 56580081120.

The previous prime is 66291934561. The next prime is 66291934601. The reversal of 66291934583 is 38543919266.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66291934583 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66291934523) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1556885 + ... + 1598897.

It is an arithmetic number, because the mean of its divisors is an integer number (4755312576).

Almost surely, 2^66291934583 is an apocalyptic number.

66291934583 is a deficient number, since it is larger than the sum of its proper divisors (9793066633).

66291934583 is a wasteful number, since it uses less digits than its factorization.

66291934583 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42974.

The product of its digits is 8398080, while the sum is 56.

The spelling of 66291934583 in words is "sixty-six billion, two hundred ninety-one million, nine hundred thirty-four thousand, five hundred eighty-three".