165740190 has 128 divisors (see below), whose sum is σ = 500179968. Its totient is φ = 34145280.

The previous prime is 165740177. The next prime is 165740203. The reversal of 165740190 is 91047561.

It is an interprime number because it is at equal distance from previous prime (165740177) and next prime (165740203).

It is a super-2 number, since 2×165740190² = 54939621162472200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 362442 + ... + 362898.

It is an arithmetic number, because the mean of its divisors is an integer number (3907656).

Almost surely, 2^165740190 is an apocalyptic number.

165740190 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 165740190, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (250089984).

165740190 is an abundant number, since it is smaller than the sum of its proper divisors (334439778).

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

165740190 is a wasteful number, since it uses less digits than its factorization.

165740190 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 642.

The product of its (nonzero) digits is 7560, while the sum is 33.

The square root of 165740190 is about 12874.0121951162. The cubic root of 165740190 is about 549.2995932824.

The spelling of 165740190 in words is "one hundred sixty-five million, seven hundred forty thousand, one hundred ninety".