561316777 has 8 divisors (see below), whose sum is σ = 642526592. Its totient is φ = 480362400.

The previous prime is 561316741. The next prime is 561316781. The reversal of 561316777 is 777613165.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-561316777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (561316477) 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 7 ways as a sum of consecutive naturals, for example, 59124 + ... + 67957.

It is an arithmetic number, because the mean of its divisors is an integer number (80315824).

Almost surely, 2^561316777 is an apocalyptic number.

It is an amenable number.

561316777 is a deficient number, since it is larger than the sum of its proper divisors (81209815).

561316777 is a wasteful number, since it uses less digits than its factorization.

561316777 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127719.

The product of its digits is 185220, while the sum is 43.

The square root of 561316777 is about 23692.1247886297. The cubic root of 561316777 is about 824.9026035006.

The spelling of 561316777 in words is "five hundred sixty-one million, three hundred sixteen thousand, seven hundred seventy-seven".