17899496521 has 9 divisors (see below), whose sum is σ = 17998103349. Its totient is φ = 17801429184.

The previous prime is 17899496491. The next prime is 17899496561. The reversal of 17899496521 is 12569499871.

The square root of 17899496521 is 133789.

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

It can be written as a sum of positive squares in 4 ways, for example, as 77246521 + 17822250000 = 8789^2 + 133500^2 .

It is not a de Polignac number, because 17899496521 - 2¹⁵ = 17899463753 is a prime.

It is a super-2 number, since 2×17899496521² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 17899496521.

It is not an unprimeable number, because it can be changed into a prime (17899496561) 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, 45086695 + ... + 45087091.

It is an arithmetic number, because the mean of its divisors is an integer number (1999789261).

Almost surely, 2^17899496521 is an apocalyptic number.

17899496521 is the 133789-th square number.

17899496521 is the 66895-th centered octagonal number.

It is an amenable number.

17899496521 is a deficient number, since it is larger than the sum of its proper divisors (98606828).

17899496521 is an frugal number, since it uses more digits than its factorization.

17899496521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1468 (or 734 counting only the distinct ones).

The product of its digits is 9797760, while the sum is 61.

The spelling of 17899496521 in words is "seventeen billion, eight hundred ninety-nine million, four hundred ninety-six thousand, five hundred twenty-one".