63185561813 has 4 divisors (see below), whose sum is σ = 68929703808. Its totient is φ = 57441419820.

The previous prime is 63185561809. The next prime is 63185561821. The reversal of 63185561813 is 31816558136.

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 63185561813 - 2² = 63185561809 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63185561113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2872070981 + ... + 2872071002.

It is an arithmetic number, because the mean of its divisors is an integer number (17232425952).

Almost surely, 2^63185561813 is an apocalyptic number.

It is an amenable number.

63185561813 is a deficient number, since it is larger than the sum of its proper divisors (5744141995).

63185561813 is a wasteful number, since it uses less digits than its factorization.

63185561813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5744141994.

The product of its digits is 518400, while the sum is 47.

The spelling of 63185561813 in words is "sixty-three billion, one hundred eighty-five million, five hundred sixty-one thousand, eight hundred thirteen".