213206656541 has 4 divisors (see below), whose sum is σ = 213209255772. Its totient is φ = 213204057312.

The previous prime is 213206656529. The next prime is 213206656567. The reversal of 213206656541 is 145656602312.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 177203112025 + 36003544516 = 420955^2 + 189746^2 .

It is a cyclic number.

It is not a de Polignac number, because 213206656541 - 2⁶ = 213206656477 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213206656571) 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, 1172426 + ... + 1342011.

It is an arithmetic number, because the mean of its divisors is an integer number (53302313943).

Almost surely, 2^213206656541 is an apocalyptic number.

It is an amenable number.

213206656541 is a deficient number, since it is larger than the sum of its proper divisors (2599231).

213206656541 is an equidigital number, since it uses as much as digits as its factorization.

213206656541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2599230.

The product of its (nonzero) digits is 259200, while the sum is 41.

The spelling of 213206656541 in words is "two hundred thirteen billion, two hundred six million, six hundred fifty-six thousand, five hundred forty-one".