63682681 has 2 divisors, whose sum is σ = 63682682. Its totient is φ = 63682680.

The previous prime is 63682679. The next prime is 63682687. The reversal of 63682681 is 18628636.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 62157456 + 1525225 = 7884^2 + 1235^2 .

It is a cyclic number.

It is not a de Polignac number, because 63682681 - 2¹ = 63682679 is a prime.

It is a super-2 number, since 2×63682681² = 8110967718695522, which contains 22 as substring.

Together with 63682679, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (63682687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31841340 + 31841341.

It is an arithmetic number, because the mean of its divisors is an integer number (31841341).

Almost surely, 2^63682681 is an apocalyptic number.

It is an amenable number.

63682681 is a deficient number, since it is larger than the sum of its proper divisors (1).

63682681 is an equidigital number, since it uses as much as digits as its factorization.

63682681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 82944, while the sum is 40.

The square root of 63682681 is about 7980.1429185197. The cubic root of 63682681 is about 399.3378231595.

The spelling of 63682681 in words is "sixty-three million, six hundred eighty-two thousand, six hundred eighty-one".