66719004999 has 4 divisors (see below), whose sum is σ = 88958673336. Its totient is φ = 44479336664.

The previous prime is 66719004997. The next prime is 66719005007. The reversal of 66719004999 is 99940091766.

66719004999 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 66719004999 - 2¹ = 66719004997 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66719004997) 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, 11119834164 + ... + 11119834169.

It is an arithmetic number, because the mean of its divisors is an integer number (22239668334).

Almost surely, 2^66719004999 is an apocalyptic number.

66719004999 is a deficient number, since it is larger than the sum of its proper divisors (22239668337).

66719004999 is a wasteful number, since it uses less digits than its factorization.

66719004999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22239668336.

The product of its (nonzero) digits is 6613488, while the sum is 60.

The spelling of 66719004999 in words is "sixty-six billion, seven hundred nineteen million, four thousand, nine hundred ninety-nine".