216304642204631 has 4 divisors (see below), whose sum is σ = 216389434305264. Its totient is φ = 216219850104000.

The previous prime is 216304642204583. The next prime is 216304642204643. The reversal of 216304642204631 is 136402246403612.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-216304642204631 is a prime.

It is a super-2 number, since 2×216304642204631² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216304642209631) 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, 42396046490 + ... + 42396051591.

It is an arithmetic number, because the mean of its divisors is an integer number (54097358576316).

Almost surely, 2^{216304642204631} is an apocalyptic number.

216304642204631 is a deficient number, since it is larger than the sum of its proper divisors (84792100633).

216304642204631 is an equidigital number, since it uses as much as digits as its factorization.

216304642204631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84792100632.

The product of its (nonzero) digits is 995328, while the sum is 44.

The spelling of 216304642204631 in words is "two hundred sixteen trillion, three hundred four billion, six hundred forty-two million, two hundred four thousand, six hundred thirty-one".