2165137998 has 8 divisors (see below), whose sum is σ = 4330276008. Its totient is φ = 721712664.

The previous prime is 2165137993. The next prime is 2165138009. The reversal of 2165137998 is 8997315612.

It is a sphenic number, since it is the product of 3 distinct primes.

2165137998 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 2165137998.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2165137993) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 180428161 + ... + 180428172.

It is an arithmetic number, because the mean of its divisors is an integer number (541284501).

Almost surely, 2^2165137998 is an apocalyptic number.

2165137998 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

2165137998 is a wasteful number, since it uses less digits than its factorization.

2165137998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 360856338.

The product of its digits is 816480, while the sum is 51.

The square root of 2165137998 is about 46531.0433796621. The cubic root of 2165137998 is about 1293.6849543624.

The spelling of 2165137998 in words is "two billion, one hundred sixty-five million, one hundred thirty-seven thousand, nine hundred ninety-eight".