165990370 has 64 divisors (see below), whose sum is σ = 375653376. Its totient is φ = 51402240.

The previous prime is 165990367. The next prime is 165990373. The reversal of 165990370 is 73099561.

It is an interprime number because it is at equal distance from previous prime (165990367) and next prime (165990373).

It is not an unprimeable number, because it can be changed into a prime (165990373) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 40830 + ... + 44710.

It is an arithmetic number, because the mean of its divisors is an integer number (5869584).

Almost surely, 2^165990370 is an apocalyptic number.

165990370 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

165990370 is an abundant number, since it is smaller than the sum of its proper divisors (209663006).

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

165990370 is a wasteful number, since it uses less digits than its factorization.

165990370 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3955.

The product of its (nonzero) digits is 51030, while the sum is 40.

The square root of 165990370 is about 12883.7250048268. The cubic root of 165990370 is about 549.5758382585.

It can be divided in two parts, 1659 and 90370, that added together give a palindrome (92029).

The spelling of 165990370 in words is "one hundred sixty-five million, nine hundred ninety thousand, three hundred seventy".