8463811561 has 16 divisors (see below), whose sum is σ = 9080248320. Its totient is φ = 7869874320.

The previous prime is 8463811529. The next prime is 8463811579. The reversal of 8463811561 is 1651183648.

It is a cyclic number.

It is not a de Polignac number, because 8463811561 - 2⁵ = 8463811529 is a prime.

It is a super-2 number, since 2×8463811561² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8463811511) 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, 188400 + ... + 228958.

It is an arithmetic number, because the mean of its divisors is an integer number (567515520).

Almost surely, 2^8463811561 is an apocalyptic number.

It is an amenable number.

8463811561 is a deficient number, since it is larger than the sum of its proper divisors (616436759).

8463811561 is a wasteful number, since it uses less digits than its factorization.

8463811561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40836.

The product of its digits is 138240, while the sum is 43.

The square root of 8463811561 is about 91998.9758692998. The cubic root of 8463811561 is about 2037.9271814411.

The spelling of 8463811561 in words is "eight billion, four hundred sixty-three million, eight hundred eleven thousand, five hundred sixty-one".