165387878786 has 16 divisors (see below), whose sum is σ = 272849399424. Its totient is φ = 74708763024.

The previous prime is 165387878779. The next prime is 165387878791. The reversal of 165387878786 is 687878783561.

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, 67669760 + ... + 67672203.

It is an arithmetic number, because the mean of its divisors is an integer number (17053087464).

Almost surely, 2^165387878786 is an apocalyptic number.

165387878786 is a deficient number, since it is larger than the sum of its proper divisors (107461520638).

165387878786 is a wasteful number, since it uses less digits than its factorization.

165387878786 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135342025.

The product of its digits is 758661120, while the sum is 74.

The spelling of 165387878786 in words is "one hundred sixty-five billion, three hundred eighty-seven million, eight hundred seventy-eight thousand, seven hundred eighty-six".