66473255813 has 4 divisors (see below), whose sum is σ = 67061514828. Its totient is φ = 65884996800.

The previous prime is 66473255803. The next prime is 66473255837. The reversal of 66473255813 is 31855237466.

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

It can be written as a sum of positive squares in 2 ways, for example, as 17303297764 + 49169958049 = 131542^2 + 221743^2 .

It is a cyclic number.

It is not a de Polignac number, because 66473255813 - 2¹⁴ = 66473239429 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 (66473255803) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 294129338 + ... + 294129563.

It is an arithmetic number, because the mean of its divisors is an integer number (16765378707).

Almost surely, 2^66473255813 is an apocalyptic number.

It is an amenable number.

66473255813 is a deficient number, since it is larger than the sum of its proper divisors (588259015).

66473255813 is a wasteful number, since it uses less digits than its factorization.

66473255813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 588259014.

The product of its digits is 3628800, while the sum is 50.

The spelling of 66473255813 in words is "sixty-six billion, four hundred seventy-three million, two hundred fifty-five thousand, eight hundred thirteen".