63673561 has 4 divisors (see below), whose sum is σ = 72769792. Its totient is φ = 54577332.

The previous prime is 63673553. The next prime is 63673573. The reversal of 63673561 is 16537636.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 63673561 - 2³ = 63673553 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 63673561.

It is not an unprimeable number, because it can be changed into a prime (63673501) 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, 4548105 + ... + 4548118.

It is an arithmetic number, because the mean of its divisors is an integer number (18192448).

Almost surely, 2^63673561 is an apocalyptic number.

It is an amenable number.

63673561 is a deficient number, since it is larger than the sum of its proper divisors (9096231).

63673561 is an equidigital number, since it uses as much as digits as its factorization.

63673561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9096230.

The product of its digits is 68040, while the sum is 37.

The square root of 63673561 is about 7979.5714797225. The cubic root of 63673561 is about 399.3187591860.

The spelling of 63673561 in words is "sixty-three million, six hundred seventy-three thousand, five hundred sixty-one".