16785534481 has 27 divisors (see below), whose sum is σ = 18102813897. Its totient is φ = 15562627080.

The previous prime is 16785534473. The next prime is 16785534533. The reversal of 16785534481 is 18443558761.

The square root of 16785534481 is 129559.

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

It is not a de Polignac number, because 16785534481 - 2³ = 16785534473 is a prime.

It is a super-2 number, since 2×16785534481² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16785534881) 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, 128133786 + ... + 128133916.

Almost surely, 2^16785534481 is an apocalyptic number.

16785534481 is the 129559-th square number.

16785534481 is the 64780-th centered octagonal number.

It is an amenable number.

16785534481 is a deficient number, since it is larger than the sum of its proper divisors (1317279416).

16785534481 is an frugal number, since it uses more digits than its factorization.

16785534481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 394 (or 197 counting only the distinct ones).

The product of its digits is 3225600, while the sum is 52.

The spelling of 16785534481 in words is "sixteen billion, seven hundred eighty-five million, five hundred thirty-four thousand, four hundred eighty-one".