66433621431 has 4 divisors (see below), whose sum is σ = 88578161912. Its totient is φ = 44289080952.

The previous prime is 66433621417. The next prime is 66433621433. The reversal of 66433621431 is 13412633466.

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

It is not a de Polignac number, because 66433621431 - 2⁶ = 66433621367 is a prime.

It is a super-2 number, since 2×66433621431² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66433621431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66433621433) 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 in 3 ways as a sum of consecutive naturals, for example, 11072270236 + ... + 11072270241.

It is an arithmetic number, because the mean of its divisors is an integer number (22144540478).

Almost surely, 2^66433621431 is an apocalyptic number.

66433621431 is a deficient number, since it is larger than the sum of its proper divisors (22144540481).

66433621431 is a wasteful number, since it uses less digits than its factorization.

66433621431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22144540480.

The product of its digits is 186624, while the sum is 39.

The spelling of 66433621431 in words is "sixty-six billion, four hundred thirty-three million, six hundred twenty-one thousand, four hundred thirty-one".