1055203001561 has 2 divisors, whose sum is σ = 1055203001562. Its totient is φ = 1055203001560.

The previous prime is 1055203001543. The next prime is 1055203001569. The reversal of 1055203001561 is 1651003025501.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 604786182400 + 450416819161 = 777680^2 + 671131^2 .

It is a cyclic number.

It is not a de Polignac number, because 1055203001561 - 2³⁸ = 780325094617 is a prime.

It is a super-2 number, since 2×1055203001561² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1055203001569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 527601500780 + 527601500781.

It is an arithmetic number, because the mean of its divisors is an integer number (527601500781).

Almost surely, 2^{1055203001561} is an apocalyptic number.

It is an amenable number.

1055203001561 is a deficient number, since it is larger than the sum of its proper divisors (1).

1055203001561 is an equidigital number, since it uses as much as digits as its factorization.

1055203001561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4500, while the sum is 29.

The spelling of 1055203001561 in words is "one trillion, fifty-five billion, two hundred three million, one thousand, five hundred sixty-one".