213635558557 has 2 divisors, whose sum is σ = 213635558558. Its totient is φ = 213635558556.

The previous prime is 213635558551. The next prime is 213635558593. The reversal of 213635558557 is 755855536312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 122733911556 + 90901647001 = 350334^2 + 301499^2 .

It is a cyclic number.

It is not a de Polignac number, because 213635558557 - 2¹¹ = 213635556509 is a prime.

It is a super-2 number, since 2×213635558557² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 213635558498 and 213635558507.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213635558551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106817779278 + 106817779279.

It is an arithmetic number, because the mean of its divisors is an integer number (106817779279).

Almost surely, 2^213635558557 is an apocalyptic number.

It is an amenable number.

213635558557 is a deficient number, since it is larger than the sum of its proper divisors (1).

213635558557 is an equidigital number, since it uses as much as digits as its factorization.

213635558557 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18900000, while the sum is 55.

It can be divided in two parts, 2136355 and 58557, that added together give a palindrome (2194912).

The spelling of 213635558557 in words is "two hundred thirteen billion, six hundred thirty-five million, five hundred fifty-eight thousand, five hundred fifty-seven".