66723799296 has 288 divisors, whose sum is σ = 231032567808. Its totient is φ = 16577003520.

The previous prime is 66723799213. The next prime is 66723799297. The reversal of 66723799296 is 69299732766.

It is a Harshad number since it is a multiple of its sum of digits (66).

It is not an unprimeable number, because it can be changed into a prime (66723799297) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1335600 + ... + 1384656.

It is an arithmetic number, because the mean of its divisors is an integer number (802196416).

Almost surely, 2^66723799296 is an apocalyptic number.

66723799296 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66723799296, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (115516283904).

66723799296 is an abundant number, since it is smaller than the sum of its proper divisors (164308768512).

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

66723799296 is a wasteful number, since it uses less digits than its factorization.

66723799296 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49117 (or 49103 counting only the distinct ones).

The product of its digits is 92588832, while the sum is 66.

The spelling of 66723799296 in words is "sixty-six billion, seven hundred twenty-three million, seven hundred ninety-nine thousand, two hundred ninety-six".