66157616280 has 128 divisors (see below), whose sum is σ = 227172211200. Its totient is φ = 15098668032.

The previous prime is 66157616263. The next prime is 66157616311. The reversal of 66157616280 is 8261675166.

It is a congruent number.

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 31 ways as a sum of consecutive naturals, for example, 493804 + ... + 613316.

It is an arithmetic number, because the mean of its divisors is an integer number (1774782900).

Almost surely, 2^66157616280 is an apocalyptic number.

66157616280 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 66157616280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (113586105600).

66157616280 is an abundant number, since it is smaller than the sum of its proper divisors (161014594920).

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

66157616280 is a wasteful number, since it uses less digits than its factorization.

66157616280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120193 (or 120189 counting only the distinct ones).

The product of its (nonzero) digits is 725760, while the sum is 48.

The spelling of 66157616280 in words is "sixty-six billion, one hundred fifty-seven million, six hundred sixteen thousand, two hundred eighty".