16136618395681 has 9 divisors (see below), whose sum is σ = 18771201048081. Its totient is φ = 13831363094052.

The previous prime is 16136618395619. The next prime is 16136618395687. The reversal of 16136618395681 is 18659381663161.

The square root of 16136618395681 is 4017041.

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

It is not a de Polignac number, because 16136618395681 - 2²⁹ = 16136081524769 is a prime.

It is a super-2 number, since 2×16136618395681² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16136618395687) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 27832356 + ... + 28406218.

Almost surely, 2^{16136618395681} is an apocalyptic number.

16136618395681 is the 4017041-st square number.

16136618395681 is the 2008521-st centered octagonal number.

It is an amenable number.

16136618395681 is a deficient number, since it is larger than the sum of its proper divisors (2634582652400).

16136618395681 is an frugal number, since it uses more digits than its factorization.

16136618395681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1147740 (or 573870 counting only the distinct ones).

The product of its digits is 33592320, while the sum is 64.

The spelling of 16136618395681 in words is "sixteen trillion, one hundred thirty-six billion, six hundred eighteen million, three hundred ninety-five thousand, six hundred eighty-one".