1707990223801 has 3 divisors (see below), whose sum is σ = 1707991530703. Its totient is φ = 1707988916900.

The previous prime is 1707990223747. The next prime is 1707990223831. The reversal of 1707990223801 is 1083220997071.

The square root of 1707990223801 is 1306901.

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., 567836095401 + 1140154128400 = 753549^2 + 1067780^2 .

It is not a de Polignac number, because 1707990223801 - 2⁷ = 1707990223673 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1707990223831) 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, 653451 + ... + 1960351.

Almost surely, 2^{1707990223801} is an apocalyptic number.

1707990223801 is the 1306901-st square number.

1707990223801 is the 653451-st centered octagonal number.

It is an amenable number.

1707990223801 is a deficient number, since it is larger than the sum of its proper divisors (1306902).

1707990223801 is an frugal number, since it uses more digits than its factorization.

1707990223801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2613802 (or 1306901 counting only the distinct ones).

The product of its (nonzero) digits is 381024, while the sum is 49.

Multiplying 1707990223801 by its sum of digits (49), we get a square (83691520966249 = 9148307²).

The spelling of 1707990223801 in words is "one trillion, seven hundred seven billion, nine hundred ninety million, two hundred twenty-three thousand, eight hundred one".