63408782921 has 16 divisors (see below), whose sum is σ = 71590938048. Its totient is φ = 55658572800.

The previous prime is 63408782917. The next prime is 63408782929. The reversal of 63408782921 is 12928780436.

It is a cyclic number.

It is not a de Polignac number, because 63408782921 - 2² = 63408782917 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 63408782921.

It is not an unprimeable number, because it can be changed into a prime (63408782929) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 680975 + ... + 768468.

It is an arithmetic number, because the mean of its divisors is an integer number (4474433628).

Almost surely, 2^63408782921 is an apocalyptic number.

It is an amenable number.

63408782921 is a deficient number, since it is larger than the sum of its proper divisors (8182155127).

63408782921 is a wasteful number, since it uses less digits than its factorization.

63408782921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1449592.

The product of its (nonzero) digits is 1161216, while the sum is 50.

The spelling of 63408782921 in words is "sixty-three billion, four hundred eight million, seven hundred eighty-two thousand, nine hundred twenty-one".