66757304306513 has 4 divisors (see below), whose sum is σ = 66757748886180. Its totient is φ = 66756859726848.

The previous prime is 66757304306507. The next prime is 66757304306549. The reversal of 66757304306513 is 31560340375766.

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 41324930831809 + 25432373474704 = 6428447^2 + 5043052^2 .

It is a cyclic number.

It is not a de Polignac number, because 66757304306513 - 2⁸ = 66757304306257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66757304206513) 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, 222064520 + ... + 222364937.

It is an arithmetic number, because the mean of its divisors is an integer number (16689437221545).

Almost surely, 2^{66757304306513} is an apocalyptic number.

It is an amenable number.

66757304306513 is a deficient number, since it is larger than the sum of its proper divisors (444579667).

66757304306513 is a wasteful number, since it uses less digits than its factorization.

66757304306513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 444579666.

The product of its (nonzero) digits is 28576800, while the sum is 56.

The spelling of 66757304306513 in words is "sixty-six trillion, seven hundred fifty-seven billion, three hundred four million, three hundred six thousand, five hundred thirteen".