1561144674889 has 2 divisors, whose sum is σ = 1561144674890. Its totient is φ = 1561144674888.

The previous prime is 1561144674853. The next prime is 1561144674899. The reversal of 1561144674889 is 9884764411651.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1467574759225 + 93569915664 = 1211435^2 + 305892^2 .

It is a cyclic number.

It is not a de Polignac number, because 1561144674889 - 2¹⁵ = 1561144642121 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1561144674889.

It is not a weakly prime, because it can be changed into another prime (1561144674899) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 780572337444 + 780572337445.

It is an arithmetic number, because the mean of its divisors is an integer number (780572337445).

Almost surely, 2^{1561144674889} is an apocalyptic number.

It is an amenable number.

1561144674889 is a deficient number, since it is larger than the sum of its proper divisors (1).

1561144674889 is an equidigital number, since it uses as much as digits as its factorization.

1561144674889 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 46448640, while the sum is 64.

The spelling of 1561144674889 in words is "one trillion, five hundred sixty-one billion, one hundred forty-four million, six hundred seventy-four thousand, eight hundred eighty-nine".