66473887415280 has 320 divisors, whose sum is σ = 220704702566400. Its totient is φ = 16513848852480.

The previous prime is 66473887415269. The next prime is 66473887415339. The reversal of 66473887415280 is 8251478837466.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 72254011 + ... + 73168229.

It is an arithmetic number, because the mean of its divisors is an integer number (689702195520).

Almost surely, 2^{66473887415280} is an apocalyptic number.

66473887415280 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 66473887415280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (110352351283200).

66473887415280 is an abundant number, since it is smaller than the sum of its proper divisors (154230815151120).

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

66473887415280 is a wasteful number, since it uses less digits than its factorization.

66473887415280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 914632 (or 914626 counting only the distinct ones).

The product of its (nonzero) digits is 433520640, while the sum is 69.

The spelling of 66473887415280 in words is "sixty-six trillion, four hundred seventy-three billion, eight hundred eighty-seven million, four hundred fifteen thousand, two hundred eighty".