561138824464 has 15 divisors (see below), whose sum is σ = 1087212277893. Its totient is φ = 280567914048.

The previous prime is 561138824443. The next prime is 561138824483. The reversal of 561138824464 is 464428831165.

The square root of 561138824464 is 749092.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 7317091600 + 553821732864 = 85540^2 + 744192^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 2902732 + ... + 3090004.

Almost surely, 2^561138824464 is an apocalyptic number.

561138824464 is the 749092-nd square number.

It is an amenable number.

561138824464 is a deficient number, since it is larger than the sum of its proper divisors (526073453429).

561138824464 is an frugal number, since it uses more digits than its factorization.

561138824464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 374554 (or 187275 counting only the distinct ones).

The product of its digits is 4423680, while the sum is 52.

The spelling of 561138824464 in words is "five hundred sixty-one billion, one hundred thirty-eight million, eight hundred twenty-four thousand, four hundred sixty-four".