16969431643609 has 3 divisors (see below), whose sum is σ = 16969435763007. Its totient is φ = 16969427524212.

The previous prime is 16969431643597. The next prime is 16969431643627. The reversal of 16969431643609 is 90634613496961.

The square root of 16969431643609 is 4119397.

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

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 344469217225 + 16624962426384 = 586915^2 + 4077372^2 .

It is not a de Polignac number, because 16969431643609 - 2⁹ = 16969431643097 is a prime.

It is a super-3 number, since 3×16969431643609³ (a number of 41 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 (16969431643709) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 2059699 + ... + 6179095.

It is an arithmetic number, because the mean of its divisors is an integer number (5656478587669).

Almost surely, 2^{16969431643609} is an apocalyptic number.

16969431643609 is the 4119397-th square number.

16969431643609 is the 2059699-th centered octagonal number.

It is an amenable number.

16969431643609 is a deficient number, since it is larger than the sum of its proper divisors (4119398).

16969431643609 is an frugal number, since it uses more digits than its factorization.

16969431643609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8238794 (or 4119397 counting only the distinct ones).

The product of its (nonzero) digits is 136048896, while the sum is 67.

The spelling of 16969431643609 in words is "sixteen trillion, nine hundred sixty-nine billion, four hundred thirty-one million, six hundred forty-three thousand, six hundred nine".