66704787859 has 4 divisors (see below), whose sum is σ = 67963368816. Its totient is φ = 65446206904.

The previous prime is 66704787847. The next prime is 66704787889. The reversal of 66704787859 is 95878740766.

It is a happy number.

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 66704787859 - 2⁵ = 66704787827 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66704787794 and 66704787803.

It is not an unprimeable number, because it can be changed into a prime (66704787829) 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, 629290399 + ... + 629290504.

It is an arithmetic number, because the mean of its divisors is an integer number (16990842204).

Almost surely, 2^66704787859 is an apocalyptic number.

66704787859 is a deficient number, since it is larger than the sum of its proper divisors (1258580957).

66704787859 is a wasteful number, since it uses less digits than its factorization.

66704787859 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1258580956.

The product of its (nonzero) digits is 142248960, while the sum is 67.

The spelling of 66704787859 in words is "sixty-six billion, seven hundred four million, seven hundred eighty-seven thousand, eight hundred fifty-nine".