165081447 has 12 divisors (see below), whose sum is σ = 238774224. Its totient is φ = 109905120.

The previous prime is 165081401. The next prime is 165081451. The reversal of 165081447 is 744180561.

It is a happy number.

165081447 is a `hidden beast` number, since 1 + 6 + 508 + 144 + 7 = 666.

It is not a de Polignac number, because 165081447 - 2¹⁵ = 165048679 is a prime.

It is a super-2 number, since 2×165081447² = 54503768287227618, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165081247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5203 + ... + 18900.

It is an arithmetic number, because the mean of its divisors is an integer number (19897852).

Almost surely, 2^165081447 is an apocalyptic number.

165081447 is a deficient number, since it is larger than the sum of its proper divisors (73692777).

165081447 is a wasteful number, since it uses less digits than its factorization.

165081447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24870 (or 24867 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 36.

The square root of 165081447 is about 12848.4025077050. The cubic root of 165081447 is about 548.5708870728.

It can be divided in two parts, 16508 and 1447, that added together give a triangular number (17955 = T₁₈₉).

The spelling of 165081447 in words is "one hundred sixty-five million, eighty-one thousand, four hundred forty-seven".