8661597775 has 6 divisors (see below), whose sum is σ = 10740381272. Its totient is φ = 6929278200.

The previous prime is 8661597673. The next prime is 8661597781. The reversal of 8661597775 is 5777951668.

It is not a de Polignac number, because 8661597775 - 2⁷ = 8661597647 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 173231931 + ... + 173231980.

Almost surely, 2^8661597775 is an apocalyptic number.

8661597775 is a deficient number, since it is larger than the sum of its proper divisors (2078783497).

8661597775 is a wasteful number, since it uses less digits than its factorization.

8661597775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 346463921 (or 346463916 counting only the distinct ones).

The product of its digits is 22226400, while the sum is 61.

The square root of 8661597775 is about 93067.7053278956. The cubic root of 8661597775 is about 2053.6795131042.

The spelling of 8661597775 in words is "eight billion, six hundred sixty-one million, five hundred ninety-seven thousand, seven hundred seventy-five".