15813673642881 has 21 divisors (see below), whose sum is σ = 23709825304689. Its totient is φ = 10542377515716.

The previous prime is 15813673642853. The next prime is 15813673642937. The reversal of 15813673642881 is 18824637631851.

It is a happy number.

The square root of 15813673642881 is 3976641.

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

15813673642881 is a `hidden beast` number, since 1 + 5 + 8 + 136 + 73 + 6 + 428 + 8 + 1 = 666.

It is not a de Polignac number, because 15813673642881 - 2¹⁵ = 15813673610113 is a prime.

It is a super-2 number, since 2×15813673642881² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (15813673642831) by changing a digit.

It is a polite number, since it can be written in 20 ways as a sum of consecutive naturals, for example, 107295666 + ... + 107442948.

Almost surely, 2^{15813673642881} is an apocalyptic number.

15813673642881 is the 3976641-st square number.

15813673642881 is the 1988321-st centered octagonal number.

It is an amenable number.

15813673642881 is a deficient number, since it is larger than the sum of its proper divisors (7896151661808).

15813673642881 is an frugal number, since it uses more digits than its factorization.

15813673642881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 294584 (or 147286 counting only the distinct ones).

The product of its digits is 46448640, while the sum is 63.

The spelling of 15813673642881 in words is "fifteen trillion, eight hundred thirteen billion, six hundred seventy-three million, six hundred forty-two thousand, eight hundred eighty-one".