66312421366 has 4 divisors (see below), whose sum is σ = 99468632052. Its totient is φ = 33156210682.

The previous prime is 66312421363. The next prime is 66312421481.

It is a happy number.

66312421366 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66312421361) 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 as a sum of consecutive naturals, namely, 16578105340 + ... + 16578105343.

It is an arithmetic number, because the mean of its divisors is an integer number (24867158013).

Almost surely, 2^66312421366 is an apocalyptic number.

66312421366 is a deficient number, since it is larger than the sum of its proper divisors (33156210686).

66312421366 is a wasteful number, since it uses less digits than its factorization.

66312421366 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33156210685.

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

The spelling of 66312421366 in words is "sixty-six billion, three hundred twelve million, four hundred twenty-one thousand, three hundred sixty-six".