1686234699601 has 3 divisors (see below), whose sum is σ = 1686235998153. Its totient is φ = 1686233401050.

The previous prime is 1686234699593. The next prime is 1686234699647. The reversal of 1686234699601 is 1069964326861.

The square root of 1686234699601 is 1298551.

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 is not a de Polignac number, because 1686234699601 - 2³ = 1686234699593 is a prime.

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 1686234699601.

It is not an unprimeable number, because it can be changed into a prime (1686234699671) 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, 649276 + ... + 1947826.

It is an arithmetic number, because the mean of its divisors is an integer number (562078666051).

Almost surely, 2^{1686234699601} is an apocalyptic number.

1686234699601 is the 1298551-st square number.

1686234699601 is the 649276-th centered octagonal number.

It is an amenable number.

1686234699601 is a deficient number, since it is larger than the sum of its proper divisors (1298552).

1686234699601 is an frugal number, since it uses more digits than its factorization.

1686234699601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2597102 (or 1298551 counting only the distinct ones).

The product of its (nonzero) digits is 20155392, while the sum is 61.

The spelling of 1686234699601 in words is "one trillion, six hundred eighty-six billion, two hundred thirty-four million, six hundred ninety-nine thousand, six hundred one".