63618220621 has 4 divisors (see below), whose sum is σ = 63627176700. Its totient is φ = 63609264544.

The previous prime is 63618220609. The next prime is 63618220651. The reversal of 63618220621 is 12602281636.

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

It can be written as a sum of positive squares in 2 ways, for example, as 29462006025 + 34156214596 = 171645^2 + 184814^2 .

It is a cyclic number.

It is not a de Polignac number, because 63618220621 - 2³¹ = 61470736973 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 (63618220651) 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, 4467376 + ... + 4481593.

It is an arithmetic number, because the mean of its divisors is an integer number (15906794175).

Almost surely, 2^63618220621 is an apocalyptic number.

It is an amenable number.

63618220621 is a deficient number, since it is larger than the sum of its proper divisors (8956079).

63618220621 is an equidigital number, since it uses as much as digits as its factorization.

63618220621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8956078.

The product of its (nonzero) digits is 41472, while the sum is 37.

The spelling of 63618220621 in words is "sixty-three billion, six hundred eighteen million, two hundred twenty thousand, six hundred twenty-one".