163386532521 has 27 divisors (see below), whose sum is σ = 239696965053. Its totient is φ = 107245262520.

The previous prime is 163386532487. The next prime is 163386532577. The reversal of 163386532521 is 125235683361.

The square root of 163386532521 is 404211.

It is a perfect power (a square), and thus also a powerful number.

163386532521 is a `hidden beast` number, since 1 + 6 + 3 + 38 + 65 + 32 + 521 = 666.

It is not a de Polignac number, because 163386532521 - 2¹⁵ = 163386499753 is a prime.

It is not an unprimeable number, because it can be changed into a prime (163386532321) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 81245406 + ... + 81247416.

Almost surely, 2^163386532521 is an apocalyptic number.

163386532521 is the 404211-st square number.

163386532521 is the 202106-th centered octagonal number.

It is an amenable number.

163386532521 is a deficient number, since it is larger than the sum of its proper divisors (76310432532).

163386532521 is an frugal number, since it uses more digits than its factorization.

163386532521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4162 (or 2081 counting only the distinct ones).

The product of its digits is 777600, while the sum is 45.

The spelling of 163386532521 in words is "one hundred sixty-three billion, three hundred eighty-six million, five hundred thirty-two thousand, five hundred twenty-one".