66744423694 has 16 divisors (see below), whose sum is σ = 107978148432. Its totient is φ = 30759337728.

The previous prime is 66744423677. The next prime is 66744423703. The reversal of 66744423694 is 49632444766.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1889704 + ... + 1924699.

It is an arithmetic number, because the mean of its divisors is an integer number (6748634277).

Almost surely, 2^66744423694 is an apocalyptic number.

66744423694 is a deficient number, since it is larger than the sum of its proper divisors (41233724738).

66744423694 is a wasteful number, since it uses less digits than its factorization.

66744423694 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3815091.

The product of its digits is 20901888, while the sum is 55.

The spelling of 66744423694 in words is "sixty-six billion, seven hundred forty-four million, four hundred twenty-three thousand, six hundred ninety-four".