78167084138 has 32 divisors (see below), whose sum is σ = 140952474432. Its totient is φ = 32034643200.

The previous prime is 78167084131. The next prime is 78167084153. The reversal of 78167084138 is 83148076187.

It is a super-2 number, since 2×78167084138² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 78167084138.

It is not an unprimeable number, because it can be changed into a prime (78167084131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3165743 + ... + 3190338.

It is an arithmetic number, because the mean of its divisors is an integer number (4404764826).

Almost surely, 2^78167084138 is an apocalyptic number.

78167084138 is a deficient number, since it is larger than the sum of its proper divisors (62785390294).

78167084138 is a wasteful number, since it uses less digits than its factorization.

78167084138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6356150.

The product of its (nonzero) digits is 1806336, while the sum is 53.

The spelling of 78167084138 in words is "seventy-eight billion, one hundred sixty-seven million, eighty-four thousand, one hundred thirty-eight".