8463603721 has 4 divisors (see below), whose sum is σ = 8579543572. Its totient is φ = 8347663872.

The previous prime is 8463603703. The next prime is 8463603737. The reversal of 8463603721 is 1273063648.

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 6594252025 + 1869351696 = 81205^2 + 43236^2 .

It is a cyclic number.

It is not a de Polignac number, because 8463603721 - 2⁵ = 8463603689 is a prime.

It is a super-2 number, since 2×8463603721² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8463603791) 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, 57969816 + ... + 57969961.

It is an arithmetic number, because the mean of its divisors is an integer number (2144885893).

Almost surely, 2^8463603721 is an apocalyptic number.

It is an amenable number.

8463603721 is a deficient number, since it is larger than the sum of its proper divisors (115939851).

8463603721 is a wasteful number, since it uses less digits than its factorization.

8463603721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115939850.

The product of its (nonzero) digits is 145152, while the sum is 40.

The square root of 8463603721 is about 91997.8462845734. The cubic root of 8463603721 is about 2037.9104999791.

The spelling of 8463603721 in words is "eight billion, four hundred sixty-three million, six hundred three thousand, seven hundred twenty-one".