8721556463 has 4 divisors (see below), whose sum is σ = 8773781520. Its totient is φ = 8669331408.

The previous prime is 8721556451. The next prime is 8721556499. The reversal of 8721556463 is 3646551278.

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 8721556463 - 2²⁴ = 8704779247 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 (8721556163) 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, 26112278 + ... + 26112611.

It is an arithmetic number, because the mean of its divisors is an integer number (2193445380).

Almost surely, 2^8721556463 is an apocalyptic number.

8721556463 is a deficient number, since it is larger than the sum of its proper divisors (52225057).

8721556463 is a wasteful number, since it uses less digits than its factorization.

8721556463 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52225056.

The product of its digits is 1209600, while the sum is 47.

The square root of 8721556463 is about 93389.2738112895. The cubic root of 8721556463 is about 2058.4073893262.

The spelling of 8721556463 in words is "eight billion, seven hundred twenty-one million, five hundred fifty-six thousand, four hundred sixty-three".