8257218645 has 64 divisors (see below), whose sum is σ = 15166771200. Its totient is φ = 3802256640.

The previous prime is 8257218643. The next prime is 8257218647. The reversal of 8257218645 is 5468127528.

It is an interprime number because it is at equal distance from previous prime (8257218643) and next prime (8257218647).

It is not a de Polignac number, because 8257218645 - 2¹ = 8257218643 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 8257218594 and 8257218603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8257218643) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 278590 + ... + 306800.

It is an arithmetic number, because the mean of its divisors is an integer number (236980800).

Almost surely, 2^8257218645 is an apocalyptic number.

It is an amenable number.

8257218645 is a deficient number, since it is larger than the sum of its proper divisors (6909552555).

8257218645 is a wasteful number, since it uses less digits than its factorization.

8257218645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28330.

The product of its digits is 1075200, while the sum is 48.

The square root of 8257218645 is about 90869.2392672020. The cubic root of 8257218645 is about 2021.2091774373.

The spelling of 8257218645 in words is "eight billion, two hundred fifty-seven million, two hundred eighteen thousand, six hundred forty-five".