8501285661 has 8 divisors (see below), whose sum is σ = 12365506464. Its totient is φ = 5152294320.

The previous prime is 8501285657. The next prime is 8501285743. The reversal of 8501285661 is 1665821058.

8501285661 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 8501285661 - 2² = 8501285657 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8501285861) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 128807326 + ... + 128807391.

It is an arithmetic number, because the mean of its divisors is an integer number (1545688308).

Almost surely, 2^8501285661 is an apocalyptic number.

It is an amenable number.

8501285661 is a deficient number, since it is larger than the sum of its proper divisors (3864220803).

8501285661 is a wasteful number, since it uses less digits than its factorization.

8501285661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 257614731.

The product of its (nonzero) digits is 115200, while the sum is 42.

The square root of 8501285661 is about 92202.4167850279. The cubic root of 8501285661 is about 2040.9304403749.

The spelling of 8501285661 in words is "eight billion, five hundred one million, two hundred eighty-five thousand, six hundred sixty-one".