218807400868 has 12 divisors (see below), whose sum is σ = 437614801792. Its totient is φ = 93774600360.

The previous prime is 218807400863. The next prime is 218807400871. The reversal of 218807400868 is 868004708812.

It is a happy number.

218807400868 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (218807400863) 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, 3907274988 + ... + 3907275043.

Almost surely, 2^218807400868 is an apocalyptic number.

218807400868 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

218807400868 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

218807400868 is a wasteful number, since it uses less digits than its factorization.

218807400868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7814550042 (or 7814550040 counting only the distinct ones).

The product of its (nonzero) digits is 1376256, while the sum is 52.

The spelling of 218807400868 in words is "two hundred eighteen billion, eight hundred seven million, four hundred thousand, eight hundred sixty-eight".