66793923858 has 32 divisors (see below), whose sum is σ = 139408822656. Its totient is φ = 21294656768.

The previous prime is 66793923839. The next prime is 66793923869. The reversal of 66793923858 is 85832939766.

66793923858 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×66793923858² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2611066 + ... + 2636522.

It is an arithmetic number, because the mean of its divisors is an integer number (4356525708).

Almost surely, 2^66793923858 is an apocalyptic number.

66793923858 is an abundant number, since it is smaller than the sum of its proper divisors (72614898798).

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

66793923858 is a wasteful number, since it uses less digits than its factorization.

66793923858 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44498.

The product of its digits is 117573120, while the sum is 66.

The spelling of 66793923858 in words is "sixty-six billion, seven hundred ninety-three million, nine hundred twenty-three thousand, eight hundred fifty-eight".