66433253989 has 4 divisors (see below), whose sum is σ = 66449496960. Its totient is φ = 66417011020.

The previous prime is 66433253959. The next prime is 66433254037. The reversal of 66433253989 is 98935233466.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 98935233466 = 2 ⋅49467616733.

It is a cyclic number.

It is not a de Polignac number, because 66433253989 - 2⁹ = 66433253477 is a prime.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66433253959) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8115349 + ... + 8123530.

It is an arithmetic number, because the mean of its divisors is an integer number (16612374240).

Almost surely, 2^66433253989 is an apocalyptic number.

It is an amenable number.

66433253989 is a deficient number, since it is larger than the sum of its proper divisors (16242971).

66433253989 is a wasteful number, since it uses less digits than its factorization.

66433253989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16242970.

The product of its digits is 25194240, while the sum is 58.

The spelling of 66433253989 in words is "sixty-six billion, four hundred thirty-three million, two hundred fifty-three thousand, nine hundred eighty-nine".