66264007680 has 792 divisors, whose sum is σ = 254321114112. Its totient is φ = 15941173248.

The previous prime is 66264007679. The next prime is 66264007717. The reversal of 66264007680 is 8670046266.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 521763777 + ... + 521763903.

Almost surely, 2^66264007680 is an apocalyptic number.

66264007680 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 66264007680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (127160557056).

66264007680 is an abundant number, since it is smaller than the sum of its proper divisors (188057106432).

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

66264007680 is a wasteful number, since it uses less digits than its factorization.

66264007680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 251 (or 217 counting only the distinct ones).

The product of its (nonzero) digits is 580608, while the sum is 45.

The spelling of 66264007680 in words is "sixty-six billion, two hundred sixty-four million, seven thousand, six hundred eighty".