165211215 has 16 divisors (see below), whose sum is σ = 284671968. Its totient is φ = 81334656.

The previous prime is 165211201. The next prime is 165211223. The reversal of 165211215 is 512112561.

It is not a de Polignac number, because 165211215 - 2¹³ = 165203023 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 423424 + ... + 423813.

It is an arithmetic number, because the mean of its divisors is an integer number (17791998).

Almost surely, 2^165211215 is an apocalyptic number.

165211215 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

165211215 is a deficient number, since it is larger than the sum of its proper divisors (119460753).

165211215 is a wasteful number, since it uses less digits than its factorization.

165211215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 847258.

The product of its digits is 600, while the sum is 24.

The square root of 165211215 is about 12853.4514819950. The cubic root of 165211215 is about 548.7145904857.

Adding to 165211215 its reverse (512112561), we get a palindrome (677323776).

The spelling of 165211215 in words is "one hundred sixty-five million, two hundred eleven thousand, two hundred fifteen".