8118491647 has 24 divisors (see below), whose sum is σ = 9612790992. Its totient is φ = 6834643200.

The previous prime is 8118491603. The next prime is 8118491653. The reversal of 8118491647 is 7461948118.

It is a happy number.

It is not a de Polignac number, because 8118491647 - 2⁷ = 8118491519 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (49).

Its product of digits (387072) is a multiple of the sum of its prime divisors (4032).

It is a self number, because there is not a number n which added to its sum of digits gives 8118491647.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8118491657) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2631768 + ... + 2634850.

It is an arithmetic number, because the mean of its divisors is an integer number (400532958).

Almost surely, 2^8118491647 is an apocalyptic number.

8118491647 is a deficient number, since it is larger than the sum of its proper divisors (1494299345).

8118491647 is a wasteful number, since it uses less digits than its factorization.

8118491647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4039 (or 4032 counting only the distinct ones).

The product of its digits is 387072, while the sum is 49.

The square root of 8118491647 is about 90102.6728071926. The cubic root of 8118491647 is about 2009.8259502105.

The spelling of 8118491647 in words is "eight billion, one hundred eighteen million, four hundred ninety-one thousand, six hundred forty-seven".