63788721611 has 4 divisors (see below), whose sum is σ = 65512741152. Its totient is φ = 62064702072.

The previous prime is 63788721589. The next prime is 63788721613. The reversal of 63788721611 is 11612788736.

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

It is a cyclic number.

It is not a de Polignac number, because 63788721611 - 2³⁰ = 62714979787 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 63788721611.

It is not an unprimeable number, because it can be changed into a prime (63788721613) 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, 862009715 + ... + 862009788.

It is an arithmetic number, because the mean of its divisors is an integer number (16378185288).

Almost surely, 2^63788721611 is an apocalyptic number.

63788721611 is a deficient number, since it is larger than the sum of its proper divisors (1724019541).

63788721611 is a wasteful number, since it uses less digits than its factorization.

63788721611 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1724019540.

The product of its digits is 677376, while the sum is 50.

The spelling of 63788721611 in words is "sixty-three billion, seven hundred eighty-eight million, seven hundred twenty-one thousand, six hundred eleven".