165540426 has 16 divisors (see below), whose sum is σ = 348506400. Its totient is φ = 52275888.

The previous prime is 165540391. The next prime is 165540437. The reversal of 165540426 is 624045561.

It is a super-2 number, since 2×165540426² = 54807265280522952, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 725941 + ... + 726168.

It is an arithmetic number, because the mean of its divisors is an integer number (21781650).

Almost surely, 2^165540426 is an apocalyptic number.

165540426 is an abundant number, since it is smaller than the sum of its proper divisors (182965974).

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

165540426 is a wasteful number, since it uses less digits than its factorization.

165540426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1452133.

The product of its (nonzero) digits is 28800, while the sum is 33.

The square root of 165540426 is about 12866.2514354415. The cubic root of 165540426 is about 549.0788172215.

Adding to 165540426 its reverse (624045561), we get a palindrome (789585987).

The spelling of 165540426 in words is "one hundred sixty-five million, five hundred forty thousand, four hundred twenty-six".