63655831553 has 2 divisors, whose sum is σ = 63655831554. Its totient is φ = 63655831552.

The previous prime is 63655831549. The next prime is 63655831621. The reversal of 63655831553 is 35513855636.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 60460416769 + 3195414784 = 245887^2 + 56528^2 .

It is a cyclic number.

It is not a de Polignac number, because 63655831553 - 2² = 63655831549 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 (63655831513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31827915776 + 31827915777.

It is an arithmetic number, because the mean of its divisors is an integer number (31827915777).

Almost surely, 2^63655831553 is an apocalyptic number.

It is an amenable number.

63655831553 is a deficient number, since it is larger than the sum of its proper divisors (1).

63655831553 is an equidigital number, since it uses as much as digits as its factorization.

63655831553 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4860000, while the sum is 50.

The spelling of 63655831553 in words is "sixty-three billion, six hundred fifty-five million, eight hundred thirty-one thousand, five hundred fifty-three".