561545654077 has 2 divisors, whose sum is σ = 561545654078. Its totient is φ = 561545654076.

The previous prime is 561545654069. The next prime is 561545654093. The reversal of 561545654077 is 770456545165.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 554718102436 + 6827551641 = 744794^2 + 82629^2 .

It is a cyclic number.

It is not a de Polignac number, because 561545654077 - 2³ = 561545654069 is a prime.

It is a super-3 number, since 3×561545654077³ (a number of 36 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (561545694077) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280772827038 + 280772827039.

It is an arithmetic number, because the mean of its divisors is an integer number (280772827039).

Almost surely, 2^561545654077 is an apocalyptic number.

It is an amenable number.

561545654077 is a deficient number, since it is larger than the sum of its proper divisors (1).

561545654077 is an equidigital number, since it uses as much as digits as its factorization.

561545654077 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17640000, while the sum is 55.

The spelling of 561545654077 in words is "five hundred sixty-one billion, five hundred forty-five million, six hundred fifty-four thousand, seventy-seven".