66380992170 has 128 divisors (see below), whose sum is σ = 175575859200. Its totient is φ = 15996250368.

The previous prime is 66380992169. The next prime is 66380992193. The reversal of 66380992170 is 7129908366.

It is a super-2 number, since 2×66380992170² (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 63 ways as a sum of consecutive naturals, for example, 1347799 + ... + 1396181.

It is an arithmetic number, because the mean of its divisors is an integer number (1371686400).

Almost surely, 2^66380992170 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66380992170, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (87787929600).

66380992170 is an abundant number, since it is smaller than the sum of its proper divisors (109194867030).

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

66380992170 is a wasteful number, since it uses less digits than its factorization.

66380992170 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48524.

The product of its (nonzero) digits is 979776, while the sum is 51.

The spelling of 66380992170 in words is "sixty-six billion, three hundred eighty million, nine hundred ninety-two thousand, one hundred seventy".