213855946638 has 8 divisors (see below), whose sum is σ = 427711893288. Its totient is φ = 71285315544.

The previous prime is 213855946573. The next prime is 213855946643. The reversal of 213855946638 is 836649558312.

It is a sphenic number, since it is the product of 3 distinct primes.

213855946638 is an admirable number.

It is a Smith number, since the sum of its digits (60) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17821328881 + ... + 17821328892.

It is an arithmetic number, because the mean of its divisors is an integer number (53463986661).

Almost surely, 2^213855946638 is an apocalyptic number.

213855946638 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.

213855946638 is a wasteful number, since it uses less digits than its factorization.

213855946638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35642657778.

The product of its digits is 37324800, while the sum is 60.

The spelling of 213855946638 in words is "two hundred thirteen billion, eight hundred fifty-five million, nine hundred forty-six thousand, six hundred thirty-eight".