66565743670444 has 24 divisors (see below), whose sum is σ = 116675536678400. Its totient is φ = 33229879882704.

The previous prime is 66565743670441. The next prime is 66565743670451. The reversal of 66565743670444 is 44407634756566.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 66565743670444.

It is not an unprimeable number, because it can be changed into a prime (66565743670441) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 71095657 + ... + 72025855.

Almost surely, 2^{66565743670444} is an apocalyptic number.

It is an amenable number.

66565743670444 is a deficient number, since it is larger than the sum of its proper divisors (50109793007956).

66565743670444 is a wasteful number, since it uses less digits than its factorization.

66565743670444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 958669 (or 958667 counting only the distinct ones).

The product of its (nonzero) digits is 1219276800, while the sum is 67.

The spelling of 66565743670444 in words is "sixty-six trillion, five hundred sixty-five billion, seven hundred forty-three million, six hundred seventy thousand, four hundred forty-four".