165661433 has 8 divisors (see below), whose sum is σ = 197559168. Its totient is φ = 135821664.

The previous prime is 165661409. The next prime is 165661471. The reversal of 165661433 is 334166561.

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 165661433 - 2¹² = 165657337 is a prime.

It is a super-2 number, since 2×165661433² = 54887420767226978, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 165661393 and 165661402.

It is not an unprimeable number, because it can be changed into a prime (165661493) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 514316 + ... + 514637.

It is an arithmetic number, because the mean of its divisors is an integer number (24694896).

Almost surely, 2^165661433 is an apocalyptic number.

It is an amenable number.

165661433 is a deficient number, since it is larger than the sum of its proper divisors (31897735).

165661433 is a wasteful number, since it uses less digits than its factorization.

165661433 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1028983.

The product of its digits is 38880, while the sum is 35.

The square root of 165661433 is about 12870.9530727138. The cubic root of 165661433 is about 549.2125734670.

The spelling of 165661433 in words is "one hundred sixty-five million, six hundred sixty-one thousand, four hundred thirty-three".