8661409340667 has 4 divisors (see below), whose sum is σ = 11548545787560. Its totient is φ = 5774272893776.

The previous prime is 8661409340663. The next prime is 8661409340681. The reversal of 8661409340667 is 7660439041668.

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 8661409340667 - 2² = 8661409340663 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 8661409340667.

It is not an unprimeable number, because it can be changed into a prime (8661409340663) 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 3 ways as a sum of consecutive naturals, for example, 1443568223442 + ... + 1443568223447.

It is an arithmetic number, because the mean of its divisors is an integer number (2887136446890).

Almost surely, 2^{8661409340667} is an apocalyptic number.

8661409340667 is a deficient number, since it is larger than the sum of its proper divisors (2887136446893).

8661409340667 is a wasteful number, since it uses less digits than its factorization.

8661409340667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2887136446892.

The product of its (nonzero) digits is 31352832, while the sum is 60.

The spelling of 8661409340667 in words is "eight trillion, six hundred sixty-one billion, four hundred nine million, three hundred forty thousand, six hundred sixty-seven".