677580861409 has 3 divisors (see below), whose sum is σ = 677581684563. Its totient is φ = 677580038256.

The previous prime is 677580861383. The next prime is 677580861413. The reversal of 677580861409 is 904168085776.

The square root of 677580861409 is 823153.

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., 652322752225 + 25258109184 = 807665^2 + 158928^2 .

It is a de Polignac number, because none of the positive numbers 2^k-677580861409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (677580861449) 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, 411577 + ... + 1234729.

It is an arithmetic number, because the mean of its divisors is an integer number (225860561521).

Almost surely, 2^677580861409 is an apocalyptic number.

677580861409 is the 823153-rd square number.

677580861409 is the 411577-th centered octagonal number.

It is an amenable number.

677580861409 is a deficient number, since it is larger than the sum of its proper divisors (823154).

677580861409 is an frugal number, since it uses more digits than its factorization.

677580861409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1646306 (or 823153 counting only the distinct ones).

The product of its (nonzero) digits is 20321280, while the sum is 61.

The spelling of 677580861409 in words is "six hundred seventy-seven billion, five hundred eighty million, eight hundred sixty-one thousand, four hundred nine".