78181085413815 has 16 divisors (see below), whose sum is σ = 125109127568256. Its totient is φ = 41690115252000.

The previous prime is 78181085413807. The next prime is 78181085413861. The reversal of 78181085413815 is 51831458018187.

It is not a de Polignac number, because 78181085413815 - 2³ = 78181085413807 is a prime.

It is a super-2 number, since 2×78181085413815² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 403877221 + ... + 404070750.

It is an arithmetic number, because the mean of its divisors is an integer number (7819320473016).

Almost surely, 2^{78181085413815} is an apocalyptic number.

78181085413815 is a deficient number, since it is larger than the sum of its proper divisors (46928042154441).

78181085413815 is a wasteful number, since it uses less digits than its factorization.

78181085413815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 807954430.

The product of its (nonzero) digits is 8601600, while the sum is 60.

The spelling of 78181085413815 in words is "seventy-eight trillion, one hundred eighty-one billion, eighty-five million, four hundred thirteen thousand, eight hundred fifteen".