17158642081 has 9 divisors (see below), whose sum is σ = 19961119731. Its totient is φ = 14706621552.

The previous prime is 17158642069. The next prime is 17158642097. The reversal of 17158642081 is 18024685171.

The square root of 17158642081 is 130991.

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., 13608389025 + 3550253056 = 116655^2 + 59584^2 .

It is not a de Polignac number, because 17158642081 - 2¹⁵ = 17158609313 is a prime.

It is a super-2 number, since 2×17158642081² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (17158642001) 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, 907581 + ... + 926293.

Almost surely, 2^17158642081 is an apocalyptic number.

17158642081 is the 130991-st square number.

17158642081 is the 65496-th centered octagonal number.

It is an amenable number.

17158642081 is a deficient number, since it is larger than the sum of its proper divisors (2802477650).

17158642081 is an frugal number, since it uses more digits than its factorization.

17158642081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37440 (or 18720 counting only the distinct ones).

The product of its (nonzero) digits is 107520, while the sum is 43.

The spelling of 17158642081 in words is "seventeen billion, one hundred fifty-eight million, six hundred forty-two thousand, eighty-one".