8421746657 has 4 divisors (see below), whose sum is σ = 8693415936. Its totient is φ = 8150077380.

The previous prime is 8421746633. The next prime is 8421746659. The reversal of 8421746657 is 7566471248.

8421746657 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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 8421746657 - 2²⁶ = 8354637793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8421746659) 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, 135834593 + ... + 135834654.

It is an arithmetic number, because the mean of its divisors is an integer number (2173353984).

Almost surely, 2^8421746657 is an apocalyptic number.

It is an amenable number.

8421746657 is a deficient number, since it is larger than the sum of its proper divisors (271669279).

8421746657 is a wasteful number, since it uses less digits than its factorization.

8421746657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 271669278.

The product of its digits is 2257920, while the sum is 50.

The square root of 8421746657 is about 91770.0749536580. The cubic root of 8421746657 is about 2034.5454260170.

The spelling of 8421746657 in words is "eight billion, four hundred twenty-one million, seven hundred forty-six thousand, six hundred fifty-seven".