16368899481 has 27 divisors (see below), whose sum is σ = 25995527103. Its totient is φ = 9917986320.

The previous prime is 16368899473. The next prime is 16368899507. The reversal of 16368899481 is 18499886361.

The square root of 16368899481 is 127941.

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

16368899481 is a `hidden beast` number, since 1 + 6 + 3 + 68 + 8 + 99 + 481 = 666.

It can be written as a sum of positive squares in only one way, i.e., 4162185225 + 12206714256 = 64515^2 + 110484^2 .

It is not a de Polignac number, because 16368899481 - 2³ = 16368899473 is a prime.

It is a super-2 number, since 2×16368899481² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (16368899471) 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, 4220115 + ... + 4223991.

Almost surely, 2^16368899481 is an apocalyptic number.

16368899481 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

16368899481 is the 127941-st square number.

16368899481 is the 63971-st centered octagonal number.

It is an amenable number.

16368899481 is a deficient number, since it is larger than the sum of its proper divisors (9626627622).

16368899481 is an frugal number, since it uses more digits than its factorization.

16368899481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7782 (or 3891 counting only the distinct ones).

The product of its digits is 17915904, while the sum is 63.

It can be divided in two parts, 163688 and 99481, that added together give a square (263169 = 513²).

The spelling of 16368899481 in words is "sixteen billion, three hundred sixty-eight million, eight hundred ninety-nine thousand, four hundred eighty-one".