63985561 has 2 divisors, whose sum is σ = 63985562. Its totient is φ = 63985560.

The previous prime is 63985541. The next prime is 63985583. The reversal of 63985561 is 16558936.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 63920025 + 65536 = 7995^2 + 256^2 .

It is a cyclic number.

It is not a de Polignac number, because 63985561 - 2¹³ = 63977369 is a prime.

It is not a weakly prime, because it can be changed into another prime (63985541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31992780 + 31992781.

It is an arithmetic number, because the mean of its divisors is an integer number (31992781).

Almost surely, 2^63985561 is an apocalyptic number.

It is an amenable number.

63985561 is a deficient number, since it is larger than the sum of its proper divisors (1).

63985561 is an equidigital number, since it uses as much as digits as its factorization.

63985561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 194400, while the sum is 43.

The square root of 63985561 is about 7999.0975115947. The cubic root of 63985561 is about 399.9699164875.

It can be divided in two parts, 63985 and 561, that added together give a palindrome (64546).

The spelling of 63985561 in words is "sixty-three million, nine hundred eighty-five thousand, five hundred sixty-one".