165642130 has 32 divisors (see below), whose sum is σ = 302097600. Its totient is φ = 65387712.

The previous prime is 165642109. The next prime is 165642143. The reversal of 165642130 is 31246561.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 373689 + ... + 374131.

It is an arithmetic number, because the mean of its divisors is an integer number (9440550).

Almost surely, 2^165642130 is an apocalyptic number.

165642130 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

165642130 is a deficient number, since it is larger than the sum of its proper divisors (136455470).

165642130 is a wasteful number, since it uses less digits than its factorization.

165642130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 858.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 165642130 is about 12870.2031840993. The cubic root of 165642130 is about 549.1912410786.

Adding to 165642130 its reverse (31246561), we get a palindrome (196888691).

The spelling of 165642130 in words is "one hundred sixty-five million, six hundred forty-two thousand, one hundred thirty".