63513643 has 4 divisors (see below), whose sum is σ = 63635608. Its totient is φ = 63391680.

The previous prime is 63513631. The next prime is 63513673. The reversal of 63513643 is 34631536.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-63513643 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (63513613) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 60198 + ... + 61243.

It is an arithmetic number, because the mean of its divisors is an integer number (15908902).

Almost surely, 2^63513643 is an apocalyptic number.

63513643 is a deficient number, since it is larger than the sum of its proper divisors (121965).

63513643 is a wasteful number, since it uses less digits than its factorization.

63513643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121964.

The product of its digits is 19440, while the sum is 31.

The square root of 63513643 is about 7969.5447172345. The cubic root of 63513643 is about 398.9841787015.

The spelling of 63513643 in words is "sixty-three million, five hundred thirteen thousand, six hundred forty-three".