66864722147 has 4 divisors (see below), whose sum is σ = 67013641800. Its totient is φ = 66715802496.

The previous prime is 66864722083. The next prime is 66864722173. The reversal of 66864722147 is 74122746866.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 66864722147 - 2⁶ = 66864722083 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66864722447) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 74459153 + ... + 74460050.

It is an arithmetic number, because the mean of its divisors is an integer number (16753410450).

Almost surely, 2^66864722147 is an apocalyptic number.

66864722147 is a deficient number, since it is larger than the sum of its proper divisors (148919653).

66864722147 is a wasteful number, since it uses less digits than its factorization.

66864722147 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148919652.

The product of its digits is 5419008, while the sum is 53.

The spelling of 66864722147 in words is "sixty-six billion, eight hundred sixty-four million, seven hundred twenty-two thousand, one hundred forty-seven".