66145043623 has 16 divisors (see below), whose sum is σ = 71380880640. Its totient is φ = 61059421696.

The previous prime is 66145043537. The next prime is 66145043641. The reversal of 66145043623 is 32634054166.

It is a happy number.

It is not a de Polignac number, because 66145043623 - 2²⁹ = 65608172711 is a prime.

It is a super-2 number, since 2×66145043623² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66145043663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3194538 + ... + 3215176.

It is an arithmetic number, because the mean of its divisors is an integer number (4461305040).

Almost surely, 2^66145043623 is an apocalyptic number.

66145043623 is a deficient number, since it is larger than the sum of its proper divisors (5235837017).

66145043623 is a wasteful number, since it uses less digits than its factorization.

66145043623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24266.

The product of its (nonzero) digits is 311040, while the sum is 40.

Adding to 66145043623 its reverse (32634054166), we get a palindrome (98779097789).

The spelling of 66145043623 in words is "sixty-six billion, one hundred forty-five million, forty-three thousand, six hundred twenty-three".