8761878242209 has 3 divisors (see below), whose sum is σ = 8761881202257. Its totient is φ = 8761875282162.

The previous prime is 8761878242203. The next prime is 8761878242311. The reversal of 8761878242209 is 9022428781678.

The square root of 8761878242209 is 2960047.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 8761878242209 - 2⁷ = 8761878242081 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8761878242203) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 1480024 + ... + 4440070.

It is an arithmetic number, because the mean of its divisors is an integer number (2920627067419).

Almost surely, 2^{8761878242209} is an apocalyptic number.

8761878242209 is the 2960047-th square number.

8761878242209 is the 1480024-th centered octagonal number.

It is an amenable number.

8761878242209 is a deficient number, since it is larger than the sum of its proper divisors (2960048).

8761878242209 is an frugal number, since it uses more digits than its factorization.

8761878242209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5920094 (or 2960047 counting only the distinct ones).

The product of its (nonzero) digits is 43352064, while the sum is 64.

Multiplying 8761878242209 by its sum of digits (64), we get a square (560760207501376 = 23680376²).

The spelling of 8761878242209 in words is "eight trillion, seven hundred sixty-one billion, eight hundred seventy-eight million, two hundred forty-two thousand, two hundred nine".