1723068399649 has 3 divisors (see below), whose sum is σ = 1723069712307. Its totient is φ = 1723067086992.

The previous prime is 1723068399641. The next prime is 1723068399727. The reversal of 1723068399649 is 9469938603271.

The square root of 1723068399649 is 1312657.

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., 1121872864225 + 601195535424 = 1059185^2 + 775368^2 .

It is not a de Polignac number, because 1723068399649 - 2³ = 1723068399641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1723068399641) 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, 656329 + ... + 1968985.

It is an arithmetic number, because the mean of its divisors is an integer number (574356570769).

Almost surely, 2^{1723068399649} is an apocalyptic number.

1723068399649 is the 1312657-th square number.

1723068399649 is the 656329-th centered octagonal number.

It is an amenable number.

1723068399649 is a deficient number, since it is larger than the sum of its proper divisors (1312658).

1723068399649 is an frugal number, since it uses more digits than its factorization.

1723068399649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2625314 (or 1312657 counting only the distinct ones).

The product of its (nonzero) digits is 105815808, while the sum is 67.

The spelling of 1723068399649 in words is "one trillion, seven hundred twenty-three billion, sixty-eight million, three hundred ninety-nine thousand, six hundred forty-nine".