216193939405 has 8 divisors (see below), whose sum is σ = 263304857952. Its totient is φ = 170373731088.

The previous prime is 216193939373. The next prime is 216193939411. The reversal of 216193939405 is 504939391612.

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

It is a cyclic number.

It is not a de Polignac number, because 216193939405 - 2⁵ = 216193939373 is a prime.

It is a Duffinian number.

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, 322677187 + ... + 322677856.

It is an arithmetic number, because the mean of its divisors is an integer number (32913107244).

Almost surely, 2^216193939405 is an apocalyptic number.

It is an amenable number.

216193939405 is a deficient number, since it is larger than the sum of its proper divisors (47110918547).

216193939405 is an equidigital number, since it uses as much as digits as its factorization.

216193939405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 645355115.

The product of its (nonzero) digits is 1574640, while the sum is 52.

The spelling of 216193939405 in words is "two hundred sixteen billion, one hundred ninety-three million, nine hundred thirty-nine thousand, four hundred five".