15697834681 has 9 divisors (see below), whose sum is σ = 15786917391. Its totient is φ = 15609253944.

The previous prime is 15697834657. The next prime is 15697834687. The reversal of 15697834681 is 18643879651.

The square root of 15697834681 is 125291.

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

It can be written as a sum of positive squares in only one way, i.e., 11522090281 + 4175744400 = 107341^2 + 64620^2 .

It is not a de Polignac number, because 15697834681 - 2¹⁹ = 15697310393 is a prime.

It is a super-3 number, since 3×15697834681³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15697834687) 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, 43726380 + ... + 43726738.

Almost surely, 2^15697834681 is an apocalyptic number.

15697834681 is the 125291-st square number.

15697834681 is the 62646-th centered octagonal number.

It is an amenable number.

15697834681 is a deficient number, since it is larger than the sum of its proper divisors (89082710).

15697834681 is an frugal number, since it uses more digits than its factorization.

15697834681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1416 (or 708 counting only the distinct ones).

The product of its digits is 8709120, while the sum is 58.

The spelling of 15697834681 in words is "fifteen billion, six hundred ninety-seven million, eight hundred thirty-four thousand, six hundred eighty-one".