561394655 has 32 divisors (see below), whose sum is σ = 740067840. Its totient is φ = 406978560.

The previous prime is 561394583. The next prime is 561394667. The reversal of 561394655 is 556493165.

It is not a de Polignac number, because 561394655 - 2⁸ = 561394399 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 676781 + ... + 677609.

It is an arithmetic number, because the mean of its divisors is an integer number (23127120).

Almost surely, 2^561394655 is an apocalyptic number.

561394655 is a deficient number, since it is larger than the sum of its proper divisors (178673185).

561394655 is a wasteful number, since it uses less digits than its factorization.

561394655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1139.

The product of its digits is 486000, while the sum is 44.

The square root of 561394655 is about 23693.7682735356. The cubic root of 561394655 is about 824.9407511782.

The spelling of 561394655 in words is "five hundred sixty-one million, three hundred ninety-four thousand, six hundred fifty-five".