66044610520431 has 4 divisors (see below), whose sum is σ = 88059480693912. Its totient is φ = 44029740346952.

The previous prime is 66044610520423. The next prime is 66044610520519. The reversal of 66044610520431 is 13402501644066.

66044610520431 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 66044610520431 - 2³ = 66044610520423 is a prime.

It is a super-2 number, since 2×66044610520431² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66044610525431) 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, 11007435086736 + ... + 11007435086741.

It is an arithmetic number, because the mean of its divisors is an integer number (22014870173478).

Almost surely, 2^{66044610520431} is an apocalyptic number.

66044610520431 is a deficient number, since it is larger than the sum of its proper divisors (22014870173481).

66044610520431 is a wasteful number, since it uses less digits than its factorization.

66044610520431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22014870173480.

The product of its (nonzero) digits is 414720, while the sum is 42.

The spelling of 66044610520431 in words is "sixty-six trillion, forty-four billion, six hundred ten million, five hundred twenty thousand, four hundred thirty-one".