155400165 has 12 divisors (see below), whose sum is σ = 269360364. Its totient is φ = 82880064.

The previous prime is 155400163. The next prime is 155400173. The reversal of 155400165 is 561004551.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 69856164 + 85544001 = 8358^2 + 9249^2 .

It is not a de Polignac number, because 155400165 - 2¹ = 155400163 is a prime.

It is a super-2 number, since 2×155400165² = 48298422564054450, which contains 22 as substring.

It is a nialpdrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155400163) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1726624 + ... + 1726713.

It is an arithmetic number, because the mean of its divisors is an integer number (22446697).

Almost surely, 2^155400165 is an apocalyptic number.

155400165 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

155400165 is a deficient number, since it is larger than the sum of its proper divisors (113960199).

155400165 is a wasteful number, since it uses less digits than its factorization.

155400165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3453348 (or 3453345 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 27.

The square root of 155400165 is about 12465.9602518218. The cubic root of 155400165 is about 537.6304093164.

The spelling of 155400165 in words is "one hundred fifty-five million, four hundred thousand, one hundred sixty-five".