1561251562193 has 2 divisors, whose sum is σ = 1561251562194. Its totient is φ = 1561251562192.

The previous prime is 1561251562147. The next prime is 1561251562229. The reversal of 1561251562193 is 3912651521651.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1240042599184 + 321208963009 = 1113572^2 + 566753^2 .

It is a cyclic number.

It is not a de Polignac number, because 1561251562193 - 2¹⁴ = 1561251545809 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1561251562103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 780625781096 + 780625781097.

It is an arithmetic number, because the mean of its divisors is an integer number (780625781097).

Almost surely, 2^{1561251562193} is an apocalyptic number.

It is an amenable number.

1561251562193 is a deficient number, since it is larger than the sum of its proper divisors (1).

1561251562193 is an equidigital number, since it uses as much as digits as its factorization.

1561251562193 is an evil number, because the sum of its binary digits is even.

The product of its digits is 486000, while the sum is 47.

The spelling of 1561251562193 in words is "one trillion, five hundred sixty-one billion, two hundred fifty-one million, five hundred sixty-two thousand, one hundred ninety-three".