165258740 has 12 divisors (see below), whose sum is σ = 347043396. Its totient is φ = 66103488.

The previous prime is 165258689. The next prime is 165258817. The reversal of 165258740 is 47852561.

It can be written as a sum of positive squares in 2 ways, for example, as 95335696 + 69923044 = 9764^2 + 8362^2 .

It is a super-2 number, since 2×165258740² = 54620902292775200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 165258694 and 165258703.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4131449 + ... + 4131488.

It is an arithmetic number, because the mean of its divisors is an integer number (28920283).

Almost surely, 2^165258740 is an apocalyptic number.

165258740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

165258740 is an abundant number, since it is smaller than the sum of its proper divisors (181784656).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

165258740 is a wasteful number, since it uses less digits than its factorization.

165258740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8262946 (or 8262944 counting only the distinct ones).

The product of its (nonzero) digits is 67200, while the sum is 38.

The square root of 165258740 is about 12855.3000742884. The cubic root of 165258740 is about 548.7672002330.

The spelling of 165258740 in words is "one hundred sixty-five million, two hundred fifty-eight thousand, seven hundred forty".