63545144561 has 2 divisors, whose sum is σ = 63545144562. Its totient is φ = 63545144560.

The previous prime is 63545144539. The next prime is 63545144581. The reversal of 63545144561 is 16544154536.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 52478104561 + 11067040000 = 229081^2 + 105200^2 .

It is a cyclic number.

It is not a de Polignac number, because 63545144561 - 2²⁶ = 63478035697 is a prime.

It is not a weakly prime, because it can be changed into another prime (63545144581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31772572280 + 31772572281.

It is an arithmetic number, because the mean of its divisors is an integer number (31772572281).

Almost surely, 2^63545144561 is an apocalyptic number.

It is an amenable number.

63545144561 is a deficient number, since it is larger than the sum of its proper divisors (1).

63545144561 is an equidigital number, since it uses as much as digits as its factorization.

63545144561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 864000, while the sum is 44.

The spelling of 63545144561 in words is "sixty-three billion, five hundred forty-five million, one hundred forty-four thousand, five hundred sixty-one".