66715799627 has 4 divisors (see below), whose sum is σ = 67009702056. Its totient is φ = 66421897200.

The previous prime is 66715799621. The next prime is 66715799641. The reversal of 66715799627 is 72699751766.

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 66715799627 - 2¹⁴ = 66715783243 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66715799621) 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, 146950874 + ... + 146951327.

It is an arithmetic number, because the mean of its divisors is an integer number (16752425514).

Almost surely, 2^66715799627 is an apocalyptic number.

66715799627 is a deficient number, since it is larger than the sum of its proper divisors (293902429).

66715799627 is a wasteful number, since it uses less digits than its factorization.

66715799627 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 293902428.

The product of its digits is 60011280, while the sum is 65.

The spelling of 66715799627 in words is "sixty-six billion, seven hundred fifteen million, seven hundred ninety-nine thousand, six hundred twenty-seven".