165746820878 has 16 divisors (see below), whose sum is σ = 252713430960. Its totient is φ = 81509198400.

The previous prime is 165746820839. The next prime is 165746820917. The reversal of 165746820878 is 878028647561.

It is an interprime number because it is at equal distance from previous prime (165746820839) and next prime (165746820917).

It is a self number, because there is not a number n which added to its sum of digits gives 165746820878.

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, 2143493 + ... + 2219471.

It is an arithmetic number, because the mean of its divisors is an integer number (15794589435).

Almost surely, 2^165746820878 is an apocalyptic number.

165746820878 is a deficient number, since it is larger than the sum of its proper divisors (86966610082).

165746820878 is a wasteful number, since it uses less digits than its factorization.

165746820878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93923.

The product of its (nonzero) digits is 36126720, while the sum is 62.

The spelling of 165746820878 in words is "one hundred sixty-five billion, seven hundred forty-six million, eight hundred twenty thousand, eight hundred seventy-eight".