8661178794197 has 4 divisors (see below), whose sum is σ = 9170659899756. Its totient is φ = 8151697688640.

The previous prime is 8661178794181. The next prime is 8661178794211. The reversal of 8661178794197 is 7914978711668.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7586906660356 + 1074272133841 = 2754434^2 + 1036471^2 .

It is a cyclic number.

It is not a de Polignac number, because 8661178794197 - 2⁴ = 8661178794181 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8661178794097) 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, 254740552754 + ... + 254740552787.

It is an arithmetic number, because the mean of its divisors is an integer number (2292664974939).

Almost surely, 2^{8661178794197} is an apocalyptic number.

It is an amenable number.

8661178794197 is a deficient number, since it is larger than the sum of its proper divisors (509481105559).

8661178794197 is a wasteful number, since it uses less digits than its factorization.

8661178794197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 509481105558.

The product of its digits is 256048128, while the sum is 74.

The spelling of 8661178794197 in words is "eight trillion, six hundred sixty-one billion, one hundred seventy-eight million, seven hundred ninety-four thousand, one hundred ninety-seven".