66343213554 has 16 divisors (see below), whose sum is σ = 132708248640. Its totient is φ = 22110767600.

The previous prime is 66343213549. The next prime is 66343213567. The reversal of 66343213554 is 45531234366.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 869574 + ... + 942785.

It is an arithmetic number, because the mean of its divisors is an integer number (8294265540).

Almost surely, 2^66343213554 is an apocalyptic number.

66343213554 is an abundant number, since it is smaller than the sum of its proper divisors (66365035086).

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

66343213554 is a wasteful number, since it uses less digits than its factorization.

66343213554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1818465.

The product of its digits is 777600, while the sum is 42.

The spelling of 66343213554 in words is "sixty-six billion, three hundred forty-three million, two hundred thirteen thousand, five hundred fifty-four".