165520030 has 16 divisors (see below), whose sum is σ = 320854464. Its totient is φ = 61115040.

The previous prime is 165520021. The next prime is 165520031. The reversal of 165520030 is 30025561.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 165519983 and 165520010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165520031) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 636486 + ... + 636745.

It is an arithmetic number, because the mean of its divisors is an integer number (20053404).

Almost surely, 2^165520030 is an apocalyptic number.

165520030 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

165520030 is a deficient number, since it is larger than the sum of its proper divisors (155334434).

165520030 is a wasteful number, since it uses less digits than its factorization.

165520030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1273251.

The product of its (nonzero) digits is 900, while the sum is 22.

The square root of 165520030 is about 12865.4587947729. The cubic root of 165520030 is about 549.0562658890.

Adding to 165520030 its reverse (30025561), we get a palindrome (195545591).

The spelling of 165520030 in words is "one hundred sixty-five million, five hundred twenty thousand, thirty".