8961158636565 has 64 divisors (see below), whose sum is σ = 14491775370240. Its totient is φ = 4728264053760.

The previous prime is 8961158636561. The next prime is 8961158636567. The reversal of 8961158636565 is 5656368511698.

It is not a de Polignac number, because 8961158636565 - 2² = 8961158636561 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 8961158636565.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8961158636561) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1356309492 + ... + 1356316098.

It is an arithmetic number, because the mean of its divisors is an integer number (226433990160).

Almost surely, 2^{8961158636565} is an apocalyptic number.

It is an amenable number.

8961158636565 is a deficient number, since it is larger than the sum of its proper divisors (5530616733675).

8961158636565 is a wasteful number, since it uses less digits than its factorization.

8961158636565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9182.

The product of its digits is 279936000, while the sum is 69.

The spelling of 8961158636565 in words is "eight trillion, nine hundred sixty-one billion, one hundred fifty-eight million, six hundred thirty-six thousand, five hundred sixty-five".