78326674967639 has 4 divisors (see below), whose sum is σ = 89516199963024. Its totient is φ = 67137149972256.

The previous prime is 78326674967627. The next prime is 78326674967641. The reversal of 78326674967639 is 93676947662387.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 78326674967639 - 2⁴⁰ = 77227163339863 is a prime.

It is a super-2 number, since 2×78326674967639² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78326674969639) 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, 5594762497682 + ... + 5594762497695.

It is an arithmetic number, because the mean of its divisors is an integer number (22379049990756).

Almost surely, 2^{78326674967639} is an apocalyptic number.

78326674967639 is a deficient number, since it is larger than the sum of its proper divisors (11189524995385).

78326674967639 is a wasteful number, since it uses less digits than its factorization.

78326674967639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11189524995384.

The product of its digits is 20739898368, while the sum is 83.

The spelling of 78326674967639 in words is "seventy-eight trillion, three hundred twenty-six billion, six hundred seventy-four million, nine hundred sixty-seven thousand, six hundred thirty-nine".