66721264803 has 24 divisors (see below), whose sum is σ = 98685238080. Its totient is φ = 43416097200.

The previous prime is 66721264789. The next prime is 66721264849. The reversal of 66721264803 is 30846212766.

It is not a de Polignac number, because 66721264803 - 2⁶ = 66721264739 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66721263803) 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 23 ways as a sum of consecutive naturals, for example, 502128 + ... + 620946.

It is an arithmetic number, because the mean of its divisors is an integer number (4111884920).

Almost surely, 2^66721264803 is an apocalyptic number.

66721264803 is a deficient number, since it is larger than the sum of its proper divisors (31963973277).

66721264803 is a wasteful number, since it uses less digits than its factorization.

66721264803 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120319 (or 120316 counting only the distinct ones).

The product of its (nonzero) digits is 580608, while the sum is 45.

The spelling of 66721264803 in words is "sixty-six billion, seven hundred twenty-one million, two hundred sixty-four thousand, eight hundred three".