561077766 has 28 divisors (see below), whose sum is σ = 1261851012. Its totient is φ = 187025436.

The previous prime is 561077729. The next prime is 561077767. The reversal of 561077766 is 667770165.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561077767) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 190956 + ... + 193871.

Almost surely, 2^561077766 is an apocalyptic number.

561077766 is an abundant number, since it is smaller than the sum of its proper divisors (700773246).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

561077766 is an equidigital number, since it uses as much as digits as its factorization.

561077766 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 384847 (or 384832 counting only the distinct ones).

The product of its (nonzero) digits is 370440, while the sum is 45.

The square root of 561077766 is about 23687.0801493135. The cubic root of 561077766 is about 824.7855045678.

The spelling of 561077766 in words is "five hundred sixty-one million, seventy-seven thousand, seven hundred sixty-six".