165158399 has 16 divisors (see below), whose sum is σ = 194211072. Its totient is φ = 137507328.

The previous prime is 165158387. The next prime is 165158437. The reversal of 165158399 is 993851561.

It is not a de Polignac number, because 165158399 - 2⁸ = 165158143 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165158369) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 56672 + ... + 59514.

It is an arithmetic number, because the mean of its divisors is an integer number (12138192).

Almost surely, 2^165158399 is an apocalyptic number.

165158399 is a deficient number, since it is larger than the sum of its proper divisors (29052673).

165158399 is a wasteful number, since it uses less digits than its factorization.

165158399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3086.

The product of its digits is 291600, while the sum is 47.

The square root of 165158399 is about 12851.3967723357. The cubic root of 165158399 is about 548.6561118111.

The spelling of 165158399 in words is "one hundred sixty-five million, one hundred fifty-eight thousand, three hundred ninety-nine".