165841623 has 12 divisors (see below), whose sum is σ = 239687968. Its totient is φ = 110496960.

The previous prime is 165841609. The next prime is 165841631. The reversal of 165841623 is 326148561.

It is a happy number.

165841623 is a `hidden beast` number, since 16 + 584 + 1 + 62 + 3 = 666.

It is not a de Polignac number, because 165841623 - 2⁴ = 165841607 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 (165841603) 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, 15186 + ... + 23712.

Almost surely, 2^165841623 is an apocalyptic number.

165841623 is a deficient number, since it is larger than the sum of its proper divisors (73846345).

165841623 is a wasteful number, since it uses less digits than its factorization.

165841623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10694 (or 10691 counting only the distinct ones).

The product of its digits is 34560, while the sum is 36.

The square root of 165841623 is about 12877.9510404412. The cubic root of 165841623 is about 549.4116275517.

It can be divided in two parts, 165841 and 623, that added together give a square (166464 = 408²).

The spelling of 165841623 in words is "one hundred sixty-five million, eight hundred forty-one thousand, six hundred twenty-three".