78082800315815 has 4 divisors (see below), whose sum is σ = 93699360378984. Its totient is φ = 62466240252648.

The previous prime is 78082800315809. The next prime is 78082800315841. The reversal of 78082800315815 is 51851300828087.

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 78082800315815 - 2²⁸ = 78082531880359 is a prime.

It is a super-2 number, since 2×78082800315815² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7808280031577 + ... + 7808280031586.

It is an arithmetic number, because the mean of its divisors is an integer number (23424840094746).

Almost surely, 2^{78082800315815} is an apocalyptic number.

78082800315815 is a deficient number, since it is larger than the sum of its proper divisors (15616560063169).

78082800315815 is a wasteful number, since it uses less digits than its factorization.

78082800315815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15616560063168.

The product of its (nonzero) digits is 4300800, while the sum is 56.

The spelling of 78082800315815 in words is "seventy-eight trillion, eighty-two billion, eight hundred million, three hundred fifteen thousand, eight hundred fifteen".