66715514880 has 1152 divisors, whose sum is σ = 271045232640. Its totient is φ = 13927710720.

The previous prime is 66715514849. The next prime is 66715514909. The reversal of 66715514880 is 8841551766.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1419479017 + ... + 1419479063.

It is an arithmetic number, because the mean of its divisors is an integer number (235282320).

Almost surely, 2^66715514880 is an apocalyptic number.

66715514880 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 66715514880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (135522616320).

66715514880 is an abundant number, since it is smaller than the sum of its proper divisors (204329717760).

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

66715514880 is a wasteful number, since it uses less digits than its factorization.

66715514880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155 (or 128 counting only the distinct ones).

The product of its (nonzero) digits is 1612800, while the sum is 51.

The spelling of 66715514880 in words is "sixty-six billion, seven hundred fifteen million, five hundred fourteen thousand, eight hundred eighty".