8421757641 has 12 divisors (see below), whose sum is σ = 13270648560. Its totient is φ = 5104095480.

The previous prime is 8421757637. The next prime is 8421757649. The reversal of 8421757641 is 1467571248.

8421757641 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 8421757641 - 2² = 8421757637 is a prime.

It is not an unprimeable number, because it can be changed into a prime (8421757649) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 42534031 + ... + 42534228.

It is an arithmetic number, because the mean of its divisors is an integer number (1105887380).

Almost surely, 2^8421757641 is an apocalyptic number.

It is an amenable number.

8421757641 is a deficient number, since it is larger than the sum of its proper divisors (4848890919).

8421757641 is a wasteful number, since it uses less digits than its factorization.

8421757641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85068276 (or 85068273 counting only the distinct ones).

The product of its digits is 376320, while the sum is 45.

The square root of 8421757641 is about 91770.1347988549. The cubic root of 8421757641 is about 2034.5463105302.

The spelling of 8421757641 in words is "eight billion, four hundred twenty-one million, seven hundred fifty-seven thousand, six hundred forty-one".