66199634280 has 192 divisors, whose sum is σ = 231846647760. Its totient is φ = 16284893184.

The previous prime is 66199634273. The next prime is 66199634299. The reversal of 66199634280 is 8243699166.

66199634280 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 8 ways, for example, as 40514443524 + 25685190756 = 201282^2 + 160266^2 .

It is a super-2 number, since 2×66199634280² (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 47 ways as a sum of consecutive naturals, for example, 9436054 + ... + 9443066.

Almost surely, 2^66199634280 is an apocalyptic number.

66199634280 is a gapful number since it is divisible by the number (60) 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 66199634280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (115923323880).

66199634280 is an abundant number, since it is smaller than the sum of its proper divisors (165647013480).

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

66199634280 is a wasteful number, since it uses less digits than its factorization.

66199634280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9060 (or 9053 counting only the distinct ones).

The product of its (nonzero) digits is 3359232, while the sum is 54.

The spelling of 66199634280 in words is "sixty-six billion, one hundred ninety-nine million, six hundred thirty-four thousand, two hundred eighty".