8787726320561 has 4 divisors (see below), whose sum is σ = 8792378374500. Its totient is φ = 8783074266624.

The previous prime is 8787726320551. The next prime is 8787726320567. The reversal of 8787726320561 is 1650236277878.

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 5660859113536 + 3126867207025 = 2379256^2 + 1768295^2 .

It is a cyclic number.

It is not a de Polignac number, because 8787726320561 - 2⁶ = 8787726320497 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 8787726320494 and 8787726320503.

It is not an unprimeable number, because it can be changed into a prime (8787726320567) 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, 2326024136 + ... + 2326027913.

It is an arithmetic number, because the mean of its divisors is an integer number (2198094593625).

Almost surely, 2^{8787726320561} is an apocalyptic number.

It is an amenable number.

8787726320561 is a deficient number, since it is larger than the sum of its proper divisors (4652053939).

8787726320561 is a wasteful number, since it uses less digits than its factorization.

8787726320561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4652053938.

The product of its (nonzero) digits is 47416320, while the sum is 62.

The spelling of 8787726320561 in words is "eight trillion, seven hundred eighty-seven billion, seven hundred twenty-six million, three hundred twenty thousand, five hundred sixty-one".