8658729285721 has 4 divisors (see below), whose sum is σ = 8763051325392. Its totient is φ = 8554407246052.

The previous prime is 8658729285697. The next prime is 8658729285743. The reversal of 8658729285721 is 1275829278568.

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 a de Polignac number, because none of the positive numbers 2^k-8658729285721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8658729285751) 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, 52161019711 + ... + 52161019876.

It is an arithmetic number, because the mean of its divisors is an integer number (2190762831348).

Almost surely, 2^{8658729285721} is an apocalyptic number.

It is an amenable number.

8658729285721 is a deficient number, since it is larger than the sum of its proper divisors (104322039671).

8658729285721 is a wasteful number, since it uses less digits than its factorization.

8658729285721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104322039670.

The product of its digits is 270950400, while the sum is 70.

The spelling of 8658729285721 in words is "eight trillion, six hundred fifty-eight billion, seven hundred twenty-nine million, two hundred eighty-five thousand, seven hundred twenty-one".