66291470280 has 256 divisors, whose sum is σ = 256097894400. Its totient is φ = 14938801920.

The previous prime is 66291470263. The next prime is 66291470281. The reversal of 66291470280 is 8207419266.

It is a happy number.

66291470280 is a `hidden beast` number, since 6 + 629 + 14 + 7 + 0 + 2 + 8 + 0 = 666.

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

It is not an unprimeable number, because it can be changed into a prime (66291470281) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 475009 + ... + 598511.

It is an arithmetic number, because the mean of its divisors is an integer number (1000382400).

Almost surely, 2^66291470280 is an apocalyptic number.

66291470280 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 66291470280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (128048947200).

66291470280 is an abundant number, since it is smaller than the sum of its proper divisors (189806424120).

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

66291470280 is a wasteful number, since it uses less digits than its factorization.

66291470280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123601 (or 123591 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 45.

The spelling of 66291470280 in words is "sixty-six billion, two hundred ninety-one million, four hundred seventy thousand, two hundred eighty".