218812831257 has 64 divisors (see below), whose sum is σ = 323209451520. Its totient is φ = 131058031104.

The previous prime is 218812831241. The next prime is 218812831261. The reversal of 218812831257 is 752138218812.

It is not a de Polignac number, because 218812831257 - 2⁴ = 218812831241 is a prime.

It is not an unprimeable number, because it can be changed into a prime (218812831297) 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, 126994398 + ... + 126996120.

It is an arithmetic number, because the mean of its divisors is an integer number (5050147680).

Almost surely, 2^218812831257 is an apocalyptic number.

It is an amenable number.

218812831257 is a deficient number, since it is larger than the sum of its proper divisors (104396620263).

218812831257 is a wasteful number, since it uses less digits than its factorization.

218812831257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2542.

The product of its digits is 430080, while the sum is 48.

The spelling of 218812831257 in words is "two hundred eighteen billion, eight hundred twelve million, eight hundred thirty-one thousand, two hundred fifty-seven".