213666144230451 has 24 divisors (see below), whose sum is σ = 314043992200512. Its totient is φ = 129121449410800.

The previous prime is 213666144230437. The next prime is 213666144230453. The reversal of 213666144230451 is 154032441666312.

It is not a de Polignac number, because 213666144230451 - 2⁹ = 213666144229939 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 213666144230451.

It is not an unprimeable number, because it can be changed into a prime (213666144230453) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 848018085 + ... + 848270006.

It is an arithmetic number, because the mean of its divisors is an integer number (13085166341688).

Almost surely, 2^{213666144230451} is an apocalyptic number.

213666144230451 is a deficient number, since it is larger than the sum of its proper divisors (100377847970061).

213666144230451 is a wasteful number, since it uses less digits than its factorization.

213666144230451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1696288463 (or 1696288452 counting only the distinct ones).

The product of its (nonzero) digits is 2488320, while the sum is 48.

Adding to 213666144230451 its reverse (154032441666312), we get a palindrome (367698585896763).

The spelling of 213666144230451 in words is "two hundred thirteen trillion, six hundred sixty-six billion, one hundred forty-four million, two hundred thirty thousand, four hundred fifty-one".