66144067654 has 16 divisors (see below), whose sum is σ = 113395696128. Its totient is φ = 28345991112.

The previous prime is 66144067607. The next prime is 66144067669. The reversal of 66144067654 is 45676044166.

It is a junction number, because it is equal to n+sod(n) for n = 66144067598 and 66144067607.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 184659 + ... + 407905.

It is an arithmetic number, because the mean of its divisors is an integer number (7087231008).

Almost surely, 2^66144067654 is an apocalyptic number.

66144067654 is a deficient number, since it is larger than the sum of its proper divisors (47251628474).

66144067654 is a wasteful number, since it uses less digits than its factorization.

66144067654 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 244419.

The product of its (nonzero) digits is 2903040, while the sum is 49.

The spelling of 66144067654 in words is "sixty-six billion, one hundred forty-four million, sixty-seven thousand, six hundred fifty-four".