218131961970768 has 40 divisors (see below), whose sum is σ = 564956174047200. Its totient is φ = 72523737135744.

The previous prime is 218131961970721. The next prime is 218131961970781. The reversal of 218131961970768 is 867079169131812.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5841132838 + ... + 5841170181.

It is an arithmetic number, because the mean of its divisors is an integer number (14123904351180).

Almost surely, 2^{218131961970768} is an apocalyptic number.

It is an amenable number.

218131961970768 is an abundant number, since it is smaller than the sum of its proper divisors (346824212076432).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

218131961970768 is a wasteful number, since it uses less digits than its factorization.

218131961970768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11682303419 (or 11682303413 counting only the distinct ones).

The product of its (nonzero) digits is 54867456, while the sum is 69.

The spelling of 218131961970768 in words is "two hundred eighteen trillion, one hundred thirty-one billion, nine hundred sixty-one million, nine hundred seventy thousand, seven hundred sixty-eight".