165479781 has 16 divisors (see below), whose sum is σ = 226169856. Its totient is φ = 107564016.

The previous prime is 165479777. The next prime is 165479791. The reversal of 165479781 is 187974561.

165479781 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 165479781 - 2² = 165479777 is a prime.

It is a super-2 number, since 2×165479781² = 54767115839615922, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 165479781.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165479711) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 141706 + ... + 142868.

It is an arithmetic number, because the mean of its divisors is an integer number (14135616).

Almost surely, 2^165479781 is an apocalyptic number.

It is an amenable number.

165479781 is a deficient number, since it is larger than the sum of its proper divisors (60690075).

165479781 is a wasteful number, since it uses less digits than its factorization.

165479781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2312.

The product of its digits is 423360, while the sum is 48.

The square root of 165479781 is about 12863.8944725149. The cubic root of 165479781 is about 549.0117581697.

The spelling of 165479781 in words is "one hundred sixty-five million, four hundred seventy-nine thousand, seven hundred eighty-one".