66823393674 has 16 divisors (see below), whose sum is σ = 134043369408. Its totient is φ = 22208367552.

The previous prime is 66823393631. The next prime is 66823393691. The reversal of 66823393674 is 47639332866.

It is a super-2 number, since 2×66823393674² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16522062 + ... + 16526105.

It is an arithmetic number, because the mean of its divisors is an integer number (8377710588).

Almost surely, 2^66823393674 is an apocalyptic number.

66823393674 is an abundant number, since it is smaller than the sum of its proper divisors (67219975734).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66823393674 is a wasteful number, since it uses less digits than its factorization.

66823393674 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33048509.

The product of its digits is 23514624, while the sum is 57.

The spelling of 66823393674 in words is "sixty-six billion, eight hundred twenty-three million, three hundred ninety-three thousand, six hundred seventy-four".