163405265520 has 160 divisors (see below), whose sum is σ = 587562536448. Its totient is φ = 36792290304.

The previous prime is 163405265467. The next prime is 163405265581. The reversal of 163405265520 is 25562504361.

163405265520 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

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 31 ways as a sum of consecutive naturals, for example, 613299 + ... + 838418.

Almost surely, 2^163405265520 is an apocalyptic number.

163405265520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

163405265520 is an abundant number, since it is smaller than the sum of its proper divisors (424157270928).

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

163405265520 is a wasteful number, since it uses less digits than its factorization.

163405265520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1451807 (or 1451801 counting only the distinct ones).

The product of its (nonzero) digits is 216000, while the sum is 39.

Adding to 163405265520 its reverse (25562504361), we get a palindrome (188967769881).

The spelling of 163405265520 in words is "one hundred sixty-three billion, four hundred five million, two hundred sixty-five thousand, five hundred twenty".