66430023643 has 4 divisors (see below), whose sum is σ = 66431770128. Its totient is φ = 66428277160.

The previous prime is 66430023629. The next prime is 66430023733. The reversal of 66430023643 is 34632003466.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34632003466 = 2 ⋅17316001733.

It is a cyclic number.

It is not a de Polignac number, because 66430023643 - 2⁹ = 66430023131 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66430023613) 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, 814888 + ... + 892693.

It is an arithmetic number, because the mean of its divisors is an integer number (16607942532).

Almost surely, 2^66430023643 is an apocalyptic number.

66430023643 is a deficient number, since it is larger than the sum of its proper divisors (1746485).

66430023643 is a wasteful number, since it uses less digits than its factorization.

66430023643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1746484.

The product of its (nonzero) digits is 186624, while the sum is 37.

The spelling of 66430023643 in words is "sixty-six billion, four hundred thirty million, twenty-three thousand, six hundred forty-three".