8219838749257 has 8 divisors (see below), whose sum is σ = 8286830671680. Its totient is φ = 8153012036400.

The previous prime is 8219838749249. The next prime is 8219838749329. The reversal of 8219838749257 is 7529478389128.

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

It is a cyclic number.

It is not a de Polignac number, because 8219838749257 - 2³ = 8219838749249 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 8219838749257.

It is not an unprimeable number, because it can be changed into a prime (8219838789257) 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, 41202478 + ... + 41401495.

It is an arithmetic number, because the mean of its divisors is an integer number (1035853833960).

Almost surely, 2^{8219838749257} is an apocalyptic number.

It is an amenable number.

8219838749257 is a deficient number, since it is larger than the sum of its proper divisors (66991922423).

8219838749257 is a wasteful number, since it uses less digits than its factorization.

8219838749257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82604783.

The product of its digits is 487710720, while the sum is 73.

The spelling of 8219838749257 in words is "eight trillion, two hundred nineteen billion, eight hundred thirty-eight million, seven hundred forty-nine thousand, two hundred fifty-seven".