16505532531 has 6 divisors (see below), whose sum is σ = 23841324780. Its totient is φ = 11003688348.

The previous prime is 16505532493. The next prime is 16505532557. The reversal of 16505532531 is 13523550561.

16505532531 is a `hidden beast` number, since 1 + 6 + 50 + 553 + 2 + 53 + 1 = 666.

It is not a de Polignac number, because 16505532531 - 2⁷ = 16505532403 is a prime.

It is a super-2 number, since 2×16505532531² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (16505532581) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 916974021 + ... + 916974038.

It is an arithmetic number, because the mean of its divisors is an integer number (3973554130).

Almost surely, 2^16505532531 is an apocalyptic number.

16505532531 is a deficient number, since it is larger than the sum of its proper divisors (7335792249).

16505532531 is a wasteful number, since it uses less digits than its factorization.

16505532531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1833948065 (or 1833948062 counting only the distinct ones).

The product of its (nonzero) digits is 67500, while the sum is 36.

The spelling of 16505532531 in words is "sixteen billion, five hundred five million, five hundred thirty-two thousand, five hundred thirty-one".