66431444775 has 48 divisors (see below), whose sum is σ = 113722066560. Its totient is φ = 34177852800.

The previous prime is 66431444773. The next prime is 66431444837. The reversal of 66431444775 is 57744413466.

It is not a de Polignac number, because 66431444775 - 2¹ = 66431444773 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66431444773) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2533884 + ... + 2559966.

It is an arithmetic number, because the mean of its divisors is an integer number (2369209720).

Almost surely, 2^66431444775 is an apocalyptic number.

66431444775 is a deficient number, since it is larger than the sum of its proper divisors (47290621785).

66431444775 is a wasteful number, since it uses less digits than its factorization.

66431444775 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27296 (or 27291 counting only the distinct ones).

The product of its digits is 6773760, while the sum is 51.

The spelling of 66431444775 in words is "sixty-six billion, four hundred thirty-one million, four hundred forty-four thousand, seven hundred seventy-five".