66213431266 has 8 divisors (see below), whose sum is σ = 99678704220. Its totient is φ = 32987196528.

The previous prime is 66213431213. The next prime is 66213431287.

It is a happy number.

66213431266 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in 2 ways, for example, as 54559149241 + 11654282025 = 233579^2 + 107955^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 59758861 + ... + 59759968.

Almost surely, 2^66213431266 is an apocalyptic number.

66213431266 is a deficient number, since it is larger than the sum of its proper divisors (33465272954).

66213431266 is a wasteful number, since it uses less digits than its factorization.

66213431266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119519108.

The product of its digits is 186624, while the sum is 40.

The spelling of 66213431266 in words is "sixty-six billion, two hundred thirteen million, four hundred thirty-one thousand, two hundred sixty-six".