66547002816 has 560 divisors, whose sum is σ = 231930074112. Its totient is φ = 18475776000.

The previous prime is 66547002799. The next prime is 66547002817. The reversal of 66547002816 is 61820074566.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66547002817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 245560761 + ... + 245561031.

Almost surely, 2^66547002816 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66547002816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (115965037056).

66547002816 is an abundant number, since it is smaller than the sum of its proper divisors (165383071296).

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

66547002816 is a wasteful number, since it uses less digits than its factorization.

66547002816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 470 (or 451 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 45.

The spelling of 66547002816 in words is "sixty-six billion, five hundred forty-seven million, two thousand, eight hundred sixteen".