165137811 has 8 divisors (see below), whose sum is σ = 221302224. Its totient is φ = 109532640.

The previous prime is 165137807. The next prime is 165137821. The reversal of 165137811 is 118731561.

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

It is not a de Polignac number, because 165137811 - 2² = 165137807 is a prime.

It is not an unprimeable number, because it can be changed into a prime (165137801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 139120 + ... + 140301.

It is an arithmetic number, because the mean of its divisors is an integer number (27662778).

Almost surely, 2^165137811 is an apocalyptic number.

165137811 is a deficient number, since it is larger than the sum of its proper divisors (56164413).

165137811 is a wasteful number, since it uses less digits than its factorization.

165137811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 279621.

The product of its digits is 5040, while the sum is 33.

The square root of 165137811 is about 12850.5957449451. The cubic root of 165137811 is about 548.6333130888.

The spelling of 165137811 in words is "one hundred sixty-five million, one hundred thirty-seven thousand, eight hundred eleven".