561878878133 has 2 divisors, whose sum is σ = 561878878134. Its totient is φ = 561878878132.

The previous prime is 561878878103. The next prime is 561878878139. The reversal of 561878878133 is 331878878165.

561878878133 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 314971255729 + 246907622404 = 561223^2 + 496898^2 .

It is a cyclic number.

It is not a de Polignac number, because 561878878133 - 2³⁴ = 544699008949 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 561878878133.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (561878878139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280939439066 + 280939439067.

It is an arithmetic number, because the mean of its divisors is an integer number (280939439067).

Almost surely, 2^561878878133 is an apocalyptic number.

It is an amenable number.

561878878133 is a deficient number, since it is larger than the sum of its proper divisors (1).

561878878133 is an equidigital number, since it uses as much as digits as its factorization.

561878878133 is an evil number, because the sum of its binary digits is even.

The product of its digits is 54190080, while the sum is 65.

The spelling of 561878878133 in words is "five hundred sixty-one billion, eight hundred seventy-eight million, eight hundred seventy-eight thousand, one hundred thirty-three".