163572989905 has 16 divisors (see below), whose sum is σ = 211953384720. Its totient is φ = 120468503808.

The previous prime is 163572989857. The next prime is 163572989929. The reversal of 163572989905 is 509989275361.

It can be written as a sum of positive squares in 8 ways, for example, as 31675456576 + 131897533329 = 177976^2 + 363177^2 .

It is a cyclic number.

It is not a de Polignac number, because 163572989905 - 2¹⁷ = 163572858833 is a prime.

It is a super-2 number, since 2×163572989905² (a number of 23 digits) contains 22 as substring.

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, 3349090 + ... + 3397579.

It is an arithmetic number, because the mean of its divisors is an integer number (13247086545).

Almost surely, 2^163572989905 is an apocalyptic number.

It is an amenable number.

163572989905 is a deficient number, since it is larger than the sum of its proper divisors (48380394815).

163572989905 is a wasteful number, since it uses less digits than its factorization.

163572989905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6747060.

The product of its (nonzero) digits is 36741600, while the sum is 64.

The spelling of 163572989905 in words is "one hundred sixty-three billion, five hundred seventy-two million, nine hundred eighty-nine thousand, nine hundred five".