8670643651 has 4 divisors (see below), whose sum is σ = 8670834072. Its totient is φ = 8670453232.

The previous prime is 8670643649. The next prime is 8670643669. The reversal of 8670643651 is 1563460768.

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 8670643651 - 2¹ = 8670643649 is a prime.

It is a super-2 number, since 2×8670643651² (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 (8670643951) 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, 17820 + ... + 132886.

It is an arithmetic number, because the mean of its divisors is an integer number (2167708518).

Almost surely, 2^8670643651 is an apocalyptic number.

8670643651 is a deficient number, since it is larger than the sum of its proper divisors (190421).

8670643651 is a wasteful number, since it uses less digits than its factorization.

8670643651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 190420.

The product of its (nonzero) digits is 725760, while the sum is 46.

The square root of 8670643651 is about 93116.2910075353. The cubic root of 8670643651 is about 2054.3941952093.

The spelling of 8670643651 in words is "eight billion, six hundred seventy million, six hundred forty-three thousand, six hundred fifty-one".