66549554783 has 16 divisors (see below), whose sum is σ = 68333129280. Its totient is φ = 64792896000.

The previous prime is 66549554777. The next prime is 66549554791. The reversal of 66549554783 is 38745594566.

It is not a de Polignac number, because 66549554783 - 2⁶ = 66549554719 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66549553783) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2777591 + ... + 2801447.

It is an arithmetic number, because the mean of its divisors is an integer number (4270820580).

Almost surely, 2^66549554783 is an apocalyptic number.

66549554783 is a deficient number, since it is larger than the sum of its proper divisors (1783574497).

66549554783 is a wasteful number, since it uses less digits than its factorization.

66549554783 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24418.

The product of its digits is 108864000, while the sum is 62.

The spelling of 66549554783 in words is "sixty-six billion, five hundred forty-nine million, five hundred fifty-four thousand, seven hundred eighty-three".