12165551814 has 16 divisors (see below), whose sum is σ = 26202727152. Its totient is φ = 3743246688.

The previous prime is 12165551809. The next prime is 12165551821. The reversal of 12165551814 is 41815556121.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 77984229 + ... + 77984384.

It is an arithmetic number, because the mean of its divisors is an integer number (1637670447).

Almost surely, 2^12165551814 is an apocalyptic number.

12165551814 is an abundant number, since it is smaller than the sum of its proper divisors (14037175338).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12165551814 is a wasteful number, since it uses less digits than its factorization.

12165551814 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155968631.

The product of its digits is 48000, while the sum is 39.

The spelling of 12165551814 in words is "twelve billion, one hundred sixty-five million, five hundred fifty-one thousand, eight hundred fourteen".