561618157741 has 2 divisors, whose sum is σ = 561618157742. Its totient is φ = 561618157740.

The previous prime is 561618157729. The next prime is 561618157781. The reversal of 561618157741 is 147751816165.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 427774862025 + 133843295716 = 654045^2 + 365846^2 .

It is a cyclic number.

It is not a de Polignac number, because 561618157741 - 2⁷ = 561618157613 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (561618157781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280809078870 + 280809078871.

It is an arithmetic number, because the mean of its divisors is an integer number (280809078871).

Almost surely, 2^561618157741 is an apocalyptic number.

It is an amenable number.

561618157741 is a deficient number, since it is larger than the sum of its proper divisors (1).

561618157741 is an equidigital number, since it uses as much as digits as its factorization.

561618157741 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1411200, while the sum is 52.

The spelling of 561618157741 in words is "five hundred sixty-one billion, six hundred eighteen million, one hundred fifty-seven thousand, seven hundred forty-one".