66744175654 has 16 divisors (see below), whose sum is σ = 109585017360. Its totient is φ = 30300003360.

The previous prime is 66744175607. The next prime is 66744175679. The reversal of 66744175654 is 45657144766.

It is a junction number, because it is equal to n+sod(n) for n = 66744175595 and 66744175604.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21040084 + ... + 21043255.

It is an arithmetic number, because the mean of its divisors is an integer number (6849063585).

Almost surely, 2^66744175654 is an apocalyptic number.

66744175654 is a deficient number, since it is larger than the sum of its proper divisors (42840841706).

66744175654 is a wasteful number, since it uses less digits than its factorization.

66744175654 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42083415.

The product of its digits is 16934400, while the sum is 55.

The spelling of 66744175654 in words is "sixty-six billion, seven hundred forty-four million, one hundred seventy-five thousand, six hundred fifty-four".