2554535561561 has 2 divisors, whose sum is σ = 2554535561562. Its totient is φ = 2554535561560.

The previous prime is 2554535561533. The next prime is 2554535561569. The reversal of 2554535561561 is 1651655354552.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1514053959961 + 1040481601600 = 1230469^2 + 1020040^2 .

It is a cyclic number.

It is not a de Polignac number, because 2554535561561 - 2⁶ = 2554535561497 is a prime.

It is not a weakly prime, because it can be changed into another prime (2554535561569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1277267780780 + 1277267780781.

It is an arithmetic number, because the mean of its divisors is an integer number (1277267780781).

Almost surely, 2^{2554535561561} is an apocalyptic number.

It is an amenable number.

2554535561561 is a deficient number, since it is larger than the sum of its proper divisors (1).

2554535561561 is an equidigital number, since it uses as much as digits as its factorization.

2554535561561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13500000, while the sum is 53.

The spelling of 2554535561561 in words is "two trillion, five hundred fifty-four billion, five hundred thirty-five million, five hundred sixty-one thousand, five hundred sixty-one".