667820823115 has 4 divisors (see below), whose sum is σ = 801384987744. Its totient is φ = 534256658488.

The previous prime is 667820823113. The next prime is 667820823151. The reversal of 667820823115 is 511328028766.

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 667820823115 - 2¹ = 667820823113 is a prime.

It is a super-2 number, since 2×667820823115² (a number of 24 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (667820823113) 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, 66782082307 + ... + 66782082316.

It is an arithmetic number, because the mean of its divisors is an integer number (200346246936).

Almost surely, 2^667820823115 is an apocalyptic number.

667820823115 is a deficient number, since it is larger than the sum of its proper divisors (133564164629).

667820823115 is a wasteful number, since it uses less digits than its factorization.

667820823115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133564164628.

The product of its (nonzero) digits is 967680, while the sum is 49.

The spelling of 667820823115 in words is "six hundred sixty-seven billion, eight hundred twenty million, eight hundred twenty-three thousand, one hundred fifteen".