66815053025280 has 832 divisors, whose sum is σ = 250424740454400. Its totient is φ = 15203645915136.

The previous prime is 66815053025269. The next prime is 66815053025317. The reversal of 66815053025280 is 8252035051866.

It is a happy number.

It is a super-3 number, since 3×66815053025280³ (a number of 42 digits) contains 333 as substring.

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, 4783772857 + ... + 4783786823.

Almost surely, 2^{66815053025280} is an apocalyptic number.

66815053025280 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 66815053025280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (125212370227200).

66815053025280 is an abundant number, since it is smaller than the sum of its proper divisors (183609687429120).

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

66815053025280 is a wasteful number, since it uses less digits than its factorization.

66815053025280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14247 (or 14211 counting only the distinct ones).

The product of its (nonzero) digits is 3456000, while the sum is 51.

The spelling of 66815053025280 in words is "sixty-six trillion, eight hundred fifteen billion, fifty-three million, twenty-five thousand, two hundred eighty".