213243657578 has 8 divisors (see below), whose sum is σ = 365560555872. Its totient is φ = 91390138956.

The previous prime is 213243657521. The next prime is 213243657611. The reversal of 213243657578 is 875756342312.

It is a happy number.

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

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7615844900 + ... + 7615844927.

It is an arithmetic number, because the mean of its divisors is an integer number (45695069484).

Almost surely, 2^213243657578 is an apocalyptic number.

213243657578 is a deficient number, since it is larger than the sum of its proper divisors (152316898294).

213243657578 is a wasteful number, since it uses less digits than its factorization.

213243657578 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15231689836.

The product of its digits is 8467200, while the sum is 53.

The spelling of 213243657578 in words is "two hundred thirteen billion, two hundred forty-three million, six hundred fifty-seven thousand, five hundred seventy-eight".