15386169681 has 27 divisors (see below), whose sum is σ = 22447596379. Its totient is φ = 10155484752.

The previous prime is 15386169647. The next prime is 15386169697. The reversal of 15386169681 is 18696168351.

The square root of 15386169681 is 124041.

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

15386169681 is a `hidden beast` number, since 1 + 538 + 6 + 16 + 96 + 8 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 13996073025 + 1390096656 = 118305^2 + 37284^2 .

It is not a de Polignac number, because 15386169681 - 2¹¹ = 15386167633 is a prime.

It is a super-2 number, since 2×15386169681² (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 (15386169781) 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, 64377160 + ... + 64377398.

Almost surely, 2^15386169681 is an apocalyptic number.

15386169681 is the 124041-st square number.

15386169681 is the 62021-st centered octagonal number.

It is an amenable number.

15386169681 is a deficient number, since it is larger than the sum of its proper divisors (7061426698).

15386169681 is an frugal number, since it uses more digits than its factorization.

15386169681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 830 (or 415 counting only the distinct ones).

The product of its digits is 1866240, while the sum is 54.

The spelling of 15386169681 in words is "fifteen billion, three hundred eighty-six million, one hundred sixty-nine thousand, six hundred eighty-one".