99170197569 has 9 divisors (see below), whose sum is σ = 143247205569. Its totient is φ = 66112835220.

The previous prime is 99170197549. The next prime is 99170197573. The reversal of 99170197569 is 96579107199.

The square root of 99170197569 is 314913.

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

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 99170197569 - 2¹⁷ = 99170066497 is a prime.

It is a super-2 number, since 2×99170197569² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (99170197549) 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, 892254 + ... + 997224.

Almost surely, 2^99170197569 is an apocalyptic number.

99170197569 is the 314913-rd square number.

99170197569 is the 157457-th centered octagonal number.

It is an amenable number.

99170197569 is a deficient number, since it is larger than the sum of its proper divisors (44077008000).

99170197569 is an frugal number, since it uses more digits than its factorization.

99170197569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 209948 (or 104974 counting only the distinct ones).

The product of its (nonzero) digits is 9644670, while the sum is 63.

The spelling of 99170197569 in words is "ninety-nine billion, one hundred seventy million, one hundred ninety-seven thousand, five hundred sixty-nine".