165105520321210 has 32 divisors (see below), whose sum is σ = 340412336318592. Its totient is φ = 56479824548160.

The previous prime is 165105520321207. The next prime is 165105520321253. The reversal of 165105520321210 is 12123025501561.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2662102501 + ... + 2662164520.

It is an arithmetic number, because the mean of its divisors is an integer number (10637885509956).

Almost surely, 2^{165105520321210} is an apocalyptic number.

165105520321210 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

165105520321210 is an abundant number, since it is smaller than the sum of its proper divisors (175306815997382).

165105520321210 is a wasteful number, since it uses less digits than its factorization.

165105520321210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5324267478.

The product of its (nonzero) digits is 18000, while the sum is 34.

Adding to 165105520321210 its reverse (12123025501561), we get a palindrome (177228545822771).

The spelling of 165105520321210 in words is "one hundred sixty-five trillion, one hundred five billion, five hundred twenty million, three hundred twenty-one thousand, two hundred ten".