66782518699 has 8 divisors (see below), whose sum is σ = 71921716832. Its totient is φ = 61643617920.

The previous prime is 66782518681. The next prime is 66782518703. The reversal of 66782518699 is 99681528766.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66782518699 - 2¹⁷ = 66782387627 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66782558699) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 663187 + ... + 757219.

It is an arithmetic number, because the mean of its divisors is an integer number (8990214604).

Almost surely, 2^66782518699 is an apocalyptic number.

66782518699 is a deficient number, since it is larger than the sum of its proper divisors (5139198133).

66782518699 is a wasteful number, since it uses less digits than its factorization.

66782518699 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148677.

The product of its digits is 78382080, while the sum is 67.

The spelling of 66782518699 in words is "sixty-six billion, seven hundred eighty-two million, five hundred eighteen thousand, six hundred ninety-nine".