165054905 has 8 divisors (see below), whose sum is σ = 198261000. Its totient is φ = 131913856.

The previous prime is 165054823. The next prime is 165054913. The reversal of 165054905 is 509450561.

It can be written as a sum of positive squares in 4 ways, for example, as 44582329 + 120472576 = 6677^2 + 10976^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 165054905 - 2¹⁴ = 165038521 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10490 + ... + 20979.

It is an arithmetic number, because the mean of its divisors is an integer number (24782625).

Almost surely, 2^165054905 is an apocalyptic number.

165054905 is the 10490-th pentagonal number.

It is an amenable number.

165054905 is a deficient number, since it is larger than the sum of its proper divisors (33206095).

165054905 is a wasteful number, since it uses less digits than its factorization.

165054905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32523.

The product of its (nonzero) digits is 27000, while the sum is 35.

The square root of 165054905 is about 12847.3695751309. The cubic root of 165054905 is about 548.5414855276.

The spelling of 165054905 in words is "one hundred sixty-five million, fifty-four thousand, nine hundred five".