165221132240535 has 64 divisors (see below), whose sum is σ = 310992386245632. Its totient is φ = 73340607614976.

The previous prime is 165221132240513. The next prime is 165221132240539. The reversal of 165221132240535 is 535042231122561.

It is not a de Polignac number, because 165221132240535 - 2⁹ = 165221132240023 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165221132240539) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 152497989 + ... + 153577598.

It is an arithmetic number, because the mean of its divisors is an integer number (4859256035088).

Almost surely, 2^{165221132240535} is an apocalyptic number.

165221132240535 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

165221132240535 is a deficient number, since it is larger than the sum of its proper divisors (145771254005097).

165221132240535 is a wasteful number, since it uses less digits than its factorization.

165221132240535 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 306075752.

The product of its (nonzero) digits is 432000, while the sum is 42.

The spelling of 165221132240535 in words is "one hundred sixty-five trillion, two hundred twenty-one billion, one hundred thirty-two million, two hundred forty thousand, five hundred thirty-five".