63813864618 has 48 divisors (see below), whose sum is σ = 158086184256. Its totient is φ = 18224352000.

The previous prime is 63813864613. The next prime is 63813864637. The reversal of 63813864618 is 81646831836.

63813864618 is a `hidden beast` number, since 6 + 3 + 8 + 13 + 8 + 6 + 4 + 618 = 666.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (63813864613) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 171130 + ... + 396122.

It is an arithmetic number, because the mean of its divisors is an integer number (3293462172).

Almost surely, 2^63813864618 is an apocalyptic number.

63813864618 is an abundant number, since it is smaller than the sum of its proper divisors (94272319638).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

63813864618 is a wasteful number, since it uses less digits than its factorization.

63813864618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 227259 (or 227256 counting only the distinct ones).

The product of its digits is 3981312, while the sum is 54.

The spelling of 63813864618 in words is "sixty-three billion, eight hundred thirteen million, eight hundred sixty-four thousand, six hundred eighteen".