66549336723 has 16 divisors (see below), whose sum is σ = 98866252800. Its totient is φ = 44242635240.

The previous prime is 66549336719. The next prime is 66549336767. The reversal of 66549336723 is 32763394566.

It is a happy number.

66549336723 is a `hidden beast` number, since 6 + 6 + 549 + 33 + 67 + 2 + 3 = 666.

It is not a de Polignac number, because 66549336723 - 2² = 66549336719 is a prime.

It is a hoax number, since the sum of its digits (54) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 66549336723.

It is not an unprimeable number, because it can be changed into a prime (66549336023) 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, 3423163 + ... + 3442548.

It is an arithmetic number, because the mean of its divisors is an integer number (6179140800).

Almost surely, 2^66549336723 is an apocalyptic number.

66549336723 is a deficient number, since it is larger than the sum of its proper divisors (32316916077).

66549336723 is a wasteful number, since it uses less digits than its factorization.

66549336723 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6866079 (or 6866073 counting only the distinct ones).

The product of its digits is 14696640, while the sum is 54.

The spelling of 66549336723 in words is "sixty-six billion, five hundred forty-nine million, three hundred thirty-six thousand, seven hundred twenty-three".