213663667831 has 8 divisors (see below), whose sum is σ = 214320687584. Its totient is φ = 213007656960.

The previous prime is 213663667817. The next prime is 213663667849. The reversal of 213663667831 is 138766366312.

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 213663667831 - 2²⁵ = 213630113399 is a prime.

It is a super-2 number, since 2×213663667831² (a number of 23 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 (213663667871) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 173095 + ... + 676231.

It is an arithmetic number, because the mean of its divisors is an integer number (26790085948).

Almost surely, 2^213663667831 is an apocalyptic number.

213663667831 is a deficient number, since it is larger than the sum of its proper divisors (657019753).

213663667831 is an equidigital number, since it uses as much as digits as its factorization.

213663667831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 504441.

The product of its digits is 3919104, while the sum is 52.

The spelling of 213663667831 in words is "two hundred thirteen billion, six hundred sixty-three million, six hundred sixty-seven thousand, eight hundred thirty-one".