63555292561 has 2 divisors, whose sum is σ = 63555292562. Its totient is φ = 63555292560.

The previous prime is 63555292531. The next prime is 63555292583. The reversal of 63555292561 is 16529255536.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 63330742336 + 224550225 = 251656^2 + 14985^2 .

It is a cyclic number.

It is not a de Polignac number, because 63555292561 - 2¹⁵ = 63555259793 is a prime.

It is not a weakly prime, because it can be changed into another prime (63555292531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31777646280 + 31777646281.

It is an arithmetic number, because the mean of its divisors is an integer number (31777646281).

Almost surely, 2^63555292561 is an apocalyptic number.

It is an amenable number.

63555292561 is a deficient number, since it is larger than the sum of its proper divisors (1).

63555292561 is an equidigital number, since it uses as much as digits as its factorization.

63555292561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2430000, while the sum is 49.

The spelling of 63555292561 in words is "sixty-three billion, five hundred fifty-five million, two hundred ninety-two thousand, five hundred sixty-one".