8640691155 has 12 divisors (see below), whose sum is σ = 14977198080. Its totient is φ = 4608368592.

The previous prime is 8640691153. The next prime is 8640691183. The reversal of 8640691155 is 5511960468.

8640691155 is a `hidden beast` number, since 8 + 6 + 406 + 91 + 155 = 666.

It is not a de Polignac number, because 8640691155 - 2¹ = 8640691153 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 192015359 = 8640691155 / (8 + 6 + 4 + 0 + 6 + 9 + 1 + 1 + 5 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 8640691155.

It is not an unprimeable number, because it can be changed into a prime (8640691151) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 96007635 + ... + 96007724.

It is an arithmetic number, because the mean of its divisors is an integer number (1248099840).

Almost surely, 2^8640691155 is an apocalyptic number.

8640691155 is a deficient number, since it is larger than the sum of its proper divisors (6336506925).

8640691155 is a wasteful number, since it uses less digits than its factorization.

8640691155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192015370 (or 192015367 counting only the distinct ones).

The product of its (nonzero) digits is 259200, while the sum is 45.

The square root of 8640691155 is about 92955.3180565803. The cubic root of 8640691155 is about 2052.0258502210.

The spelling of 8640691155 in words is "eight billion, six hundred forty million, six hundred ninety-one thousand, one hundred fifty-five".