8218220457 has 4 divisors (see below), whose sum is σ = 10957627280. Its totient is φ = 5478813636.

The previous prime is 8218220411. The next prime is 8218220503. The reversal of 8218220457 is 7540228128.

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 an interprime number because it is at equal distance from previous prime (8218220411) and next prime (8218220503).

It is not a de Polignac number, because 8218220457 - 2¹² = 8218216361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8218220407) 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, 1369703407 + ... + 1369703412.

It is an arithmetic number, because the mean of its divisors is an integer number (2739406820).

Almost surely, 2^8218220457 is an apocalyptic number.

It is an amenable number.

8218220457 is a deficient number, since it is larger than the sum of its proper divisors (2739406823).

8218220457 is a wasteful number, since it uses less digits than its factorization.

8218220457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2739406822.

The product of its (nonzero) digits is 71680, while the sum is 39.

The square root of 8218220457 is about 90654.4012003830. The cubic root of 8218220457 is about 2018.0221513178.

The spelling of 8218220457 in words is "eight billion, two hundred eighteen million, two hundred twenty thousand, four hundred fifty-seven".