165138086878 has 16 divisors (see below), whose sum is σ = 248380350336. Its totient is φ = 82344729600.

The previous prime is 165138086831. The next prime is 165138086923. The reversal of 165138086878 is 878680831561.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4007950 + ... + 4048942.

It is an arithmetic number, because the mean of its divisors is an integer number (15523771896).

Almost surely, 2^165138086878 is an apocalyptic number.

165138086878 is a deficient number, since it is larger than the sum of its proper divisors (83242263458).

165138086878 is a wasteful number, since it uses less digits than its factorization.

165138086878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46419.

The product of its (nonzero) digits is 15482880, while the sum is 61.

The spelling of 165138086878 in words is "one hundred sixty-five billion, one hundred thirty-eight million, eighty-six thousand, eight hundred seventy-eight".