561672777361 has 2 divisors, whose sum is σ = 561672777362. Its totient is φ = 561672777360.

The previous prime is 561672777319. The next prime is 561672777409. The reversal of 561672777361 is 163777276165.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 558726350400 + 2946426961 = 747480^2 + 54281^2 .

It is a cyclic number.

It is not a de Polignac number, because 561672777361 - 2²⁷ = 561538559633 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 561672777296 and 561672777305.

It is not a weakly prime, because it can be changed into another prime (561672777311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280836388680 + 280836388681.

It is an arithmetic number, because the mean of its divisors is an integer number (280836388681).

Almost surely, 2^561672777361 is an apocalyptic number.

It is an amenable number.

561672777361 is a deficient number, since it is larger than the sum of its proper divisors (1).

561672777361 is an equidigital number, since it uses as much as digits as its factorization.

561672777361 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15558480, while the sum is 58.

The spelling of 561672777361 in words is "five hundred sixty-one billion, six hundred seventy-two million, seven hundred seventy-seven thousand, three hundred sixty-one".