66734234880 has 144 divisors (see below), whose sum is σ = 213358475904. Its totient is φ = 17776926720.

The previous prime is 66734234849. The next prime is 66734234881. The reversal of 66734234880 is 8843243766.

It is a super-2 number, since 2×66734234880² (a number of 22 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (51) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66734234881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3819765 + ... + 3837195.

Almost surely, 2^66734234880 is an apocalyptic number.

66734234880 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 66734234880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (106679237952).

66734234880 is an abundant number, since it is smaller than the sum of its proper divisors (146624241024).

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

66734234880 is a wasteful number, since it uses less digits than its factorization.

66734234880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18452 (or 18438 counting only the distinct ones).

The product of its (nonzero) digits is 4644864, while the sum is 51.

The spelling of 66734234880 in words is "sixty-six billion, seven hundred thirty-four million, two hundred thirty-four thousand, eight hundred eighty".