63663643 has 4 divisors (see below), whose sum is σ = 65384320. Its totient is φ = 61942968.

The previous prime is 63663637. The next prime is 63663647. The reversal of 63663643 is 34636636.

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

It is a cyclic number.

It is not a de Polignac number, because 63663643 - 2¹³ = 63655451 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37), and also a Moran number because the ratio is a prime number: 1720639 = 63663643 / (6 + 3 + 6 + 6 + 3 + 6 + 4 + 3).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (63663647) 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, 860283 + ... + 860356.

It is an arithmetic number, because the mean of its divisors is an integer number (16346080).

Almost surely, 2^63663643 is an apocalyptic number.

63663643 is a deficient number, since it is larger than the sum of its proper divisors (1720677).

63663643 is a wasteful number, since it uses less digits than its factorization.

63663643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1720676.

The product of its digits is 139968, while the sum is 37.

The square root of 63663643 is about 7978.9499935768. The cubic root of 63663643 is about 399.2980250486.

The spelling of 63663643 in words is "sixty-three million, six hundred sixty-three thousand, six hundred forty-three".