216644364357 has 4 divisors (see below), whose sum is σ = 288859152480. Its totient is φ = 144429576236.

The previous prime is 216644364353. The next prime is 216644364371. The reversal of 216644364357 is 753463446612.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 216644364357 - 2² = 216644364353 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216644364353) 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, 36107394057 + ... + 36107394062.

It is an arithmetic number, because the mean of its divisors is an integer number (72214788120).

Almost surely, 2^216644364357 is an apocalyptic number.

It is an amenable number.

216644364357 is a deficient number, since it is larger than the sum of its proper divisors (72214788123).

216644364357 is an equidigital number, since it uses as much as digits as its factorization.

216644364357 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72214788122.

The product of its digits is 8709120, while the sum is 51.

The spelling of 216644364357 in words is "two hundred sixteen billion, six hundred forty-four million, three hundred sixty-four thousand, three hundred fifty-seven".