1398568777321 has 3 divisors (see below), whose sum is σ = 1398569959933. Its totient is φ = 1398567594710.

The previous prime is 1398568777301. The next prime is 1398568777343. The reversal of 1398568777321 is 1237778658931.

The square root of 1398568777321 is 1182611.

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 1398568777321 - 2²⁹ = 1398031906409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1398568777301) 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, 591306 + ... + 1773916.

Almost surely, 2^{1398568777321} is an apocalyptic number.

1398568777321 is the 1182611-st square number.

1398568777321 is the 591306-th centered octagonal number.

It is an amenable number.

1398568777321 is a deficient number, since it is larger than the sum of its proper divisors (1182612).

1398568777321 is an frugal number, since it uses more digits than its factorization.

1398568777321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2365222 (or 1182611 counting only the distinct ones).

The product of its digits is 106686720, while the sum is 67.

The spelling of 1398568777321 in words is "one trillion, three hundred ninety-eight billion, five hundred sixty-eight million, seven hundred seventy-seven thousand, three hundred twenty-one".