8865920561 has 4 divisors (see below), whose sum is σ = 9251395392. Its totient is φ = 8480445732.

The previous prime is 8865920519. The next prime is 8865920579. The reversal of 8865920561 is 1650295688.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 8865920561 - 2¹⁰ = 8865919537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8865920761) 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, 192737381 + ... + 192737426.

It is an arithmetic number, because the mean of its divisors is an integer number (2312848848).

Almost surely, 2^8865920561 is an apocalyptic number.

It is an amenable number.

8865920561 is a deficient number, since it is larger than the sum of its proper divisors (385474831).

8865920561 is a wasteful number, since it uses less digits than its factorization.

8865920561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 385474830.

The product of its (nonzero) digits is 1036800, while the sum is 50.

The square root of 8865920561 is about 94159.0174173456. The cubic root of 8865920561 is about 2069.7025999651.

The spelling of 8865920561 in words is "eight billion, eight hundred sixty-five million, nine hundred twenty thousand, five hundred sixty-one".