165407081 has 12 divisors (see below), whose sum is σ = 190562112. Its totient is φ = 140642424.

The previous prime is 165407069. The next prime is 165407107. The reversal of 165407081 is 180704561.

It is a happy number.

It is not a de Polignac number, because 165407081 - 2²⁶ = 98298217 is a prime.

It is a super-2 number, since 2×165407081² = 54719004889881122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165407381) 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, 134636 + ... + 135858.

It is an arithmetic number, because the mean of its divisors is an integer number (15880176).

Almost surely, 2^165407081 is an apocalyptic number.

It is an amenable number.

165407081 is a deficient number, since it is larger than the sum of its proper divisors (25155031).

165407081 is an equidigital number, since it uses as much as digits as its factorization.

165407081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1508 (or 1369 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 32.

The square root of 165407081 is about 12861.0684237353. The cubic root of 165407081 is about 548.9313475378.

The spelling of 165407081 in words is "one hundred sixty-five million, four hundred seven thousand, eighty-one".