63641562641 has 4 divisors (see below), whose sum is σ = 63753411300. Its totient is φ = 63529713984.

The previous prime is 63641562637. The next prime is 63641562659. The reversal of 63641562641 is 14626514636.

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 30770422225 + 32871140416 = 175415^2 + 181304^2 .

It is a cyclic number.

It is not a de Polignac number, because 63641562641 - 2² = 63641562637 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 63641562592 and 63641562601.

It is not an unprimeable number, because it can be changed into a prime (63641562631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55923476 + ... + 55924613.

It is an arithmetic number, because the mean of its divisors is an integer number (15938352825).

Almost surely, 2^63641562641 is an apocalyptic number.

It is an amenable number.

63641562641 is a deficient number, since it is larger than the sum of its proper divisors (111848659).

63641562641 is a wasteful number, since it uses less digits than its factorization.

63641562641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111848658.

The product of its digits is 622080, while the sum is 44.

The spelling of 63641562641 in words is "sixty-three billion, six hundred forty-one million, five hundred sixty-two thousand, six hundred forty-one".