78181161128686 has 32 divisors (see below), whose sum is σ = 148211786711808. Its totient is φ = 30042929730240.

The previous prime is 78181161128677. The next prime is 78181161128687. The reversal of 78181161128686 is 68682116118187.

It is a super-2 number, since 2×78181161128686² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78181161128687) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3477179700 + ... + 3477202183.

It is an arithmetic number, because the mean of its divisors is an integer number (4631618334744).

Almost surely, 2^{78181161128686} is an apocalyptic number.

78181161128686 is a deficient number, since it is larger than the sum of its proper divisors (70030625583122).

78181161128686 is a wasteful number, since it uses less digits than its factorization.

78181161128686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6954381976.

The product of its digits is 12386304, while the sum is 64.

The spelling of 78181161128686 in words is "seventy-eight trillion, one hundred eighty-one billion, one hundred sixty-one million, one hundred twenty-eight thousand, six hundred eighty-six".