8485746721 has 4 divisors (see below), whose sum is σ = 8683089712. Its totient is φ = 8288403732.

The previous prime is 8485746713. The next prime is 8485746739. The reversal of 8485746721 is 1276475848.

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 8485746721 - 2³ = 8485746713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8485746701) 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, 98671431 + ... + 98671516.

It is an arithmetic number, because the mean of its divisors is an integer number (2170772428).

Almost surely, 2^8485746721 is an apocalyptic number.

It is an amenable number.

8485746721 is a deficient number, since it is larger than the sum of its proper divisors (197342991).

8485746721 is a wasteful number, since it uses less digits than its factorization.

8485746721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 197342990.

The product of its digits is 3010560, while the sum is 52.

The square root of 8485746721 is about 92118.1128823208. The cubic root of 8485746721 is about 2039.6861878721.

The spelling of 8485746721 in words is "eight billion, four hundred eighty-five million, seven hundred forty-six thousand, seven hundred twenty-one".