8661492897 has 4 divisors (see below), whose sum is σ = 11548657200. Its totient is φ = 5774328596.

The previous prime is 8661492883. The next prime is 8661492937. The reversal of 8661492897 is 7982941668.

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 8661492897 - 2⁷ = 8661492769 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 8661492897.

It is not an unprimeable number, because it can be changed into a prime (8661492857) 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, 1443582147 + ... + 1443582152.

It is an arithmetic number, because the mean of its divisors is an integer number (2887164300).

Almost surely, 2^8661492897 is an apocalyptic number.

It is an amenable number.

8661492897 is a deficient number, since it is larger than the sum of its proper divisors (2887164303).

8661492897 is a wasteful number, since it uses less digits than its factorization.

8661492897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2887164302.

The product of its digits is 10450944, while the sum is 60.

The square root of 8661492897 is about 93067.1418761745. The cubic root of 8661492897 is about 2053.6712241536.

The spelling of 8661492897 in words is "eight billion, six hundred sixty-one million, four hundred ninety-two thousand, eight hundred ninety-seven".