66172725312740 has 24 divisors (see below), whose sum is σ = 146276550692160. Its totient is φ = 25075980118368.

The previous prime is 66172725312737. The next prime is 66172725312791. The reversal of 66172725312740 is 4721352727166.

66172725312740 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 2×66172725312740² (a number of 28 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 87069375032 + ... + 87069375791.

It is an arithmetic number, because the mean of its divisors is an integer number (6094856278840).

Almost surely, 2^{66172725312740} is an apocalyptic number.

It is an amenable number.

66172725312740 is an abundant number, since it is smaller than the sum of its proper divisors (80103825379420).

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

66172725312740 is a wasteful number, since it uses less digits than its factorization.

66172725312740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 174138750851 (or 174138750849 counting only the distinct ones).

The product of its (nonzero) digits is 5927040, while the sum is 53.

The spelling of 66172725312740 in words is "sixty-six trillion, one hundred seventy-two billion, seven hundred twenty-five million, three hundred twelve thousand, seven hundred forty".