66251087280 has 480 divisors, whose sum is σ = 262715042304. Its totient is φ = 14647578624.

The previous prime is 66251087249. The next prime is 66251087281. The reversal of 66251087280 is 8278015266.

66251087280 is a `hidden beast` number, since 6 + 62 + 510 + 8 + 72 + 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 (66251087281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 23187612 + ... + 23190468.

Almost surely, 2^66251087280 is an apocalyptic number.

66251087280 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 66251087280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (131357521152).

66251087280 is an abundant number, since it is smaller than the sum of its proper divisors (196463955024).

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

66251087280 is a wasteful number, since it uses less digits than its factorization.

66251087280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3033 (or 3024 counting only the distinct ones).

The product of its (nonzero) digits is 322560, while the sum is 45.

The spelling of 66251087280 in words is "sixty-six billion, two hundred fifty-one million, eighty-seven thousand, two hundred eighty".