201343541557 has 4 divisors (see below), whose sum is σ = 211940570080. Its totient is φ = 190746513036.

The previous prime is 201343541537. The next prime is 201343541569. The reversal of 201343541557 is 755145343102.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 201343541557 - 2¹⁵ = 201343508789 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 (201343541537) 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, 5298514233 + ... + 5298514270.

It is an arithmetic number, because the mean of its divisors is an integer number (52985142520).

Almost surely, 2^201343541557 is an apocalyptic number.

It is an amenable number.

201343541557 is a deficient number, since it is larger than the sum of its proper divisors (10597028523).

201343541557 is a wasteful number, since it uses less digits than its factorization.

201343541557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10597028522.

The product of its (nonzero) digits is 252000, while the sum is 40.

Adding to 201343541557 its reverse (755145343102), we get a palindrome (956488884659).

The spelling of 201343541557 in words is "two hundred one billion, three hundred forty-three million, five hundred forty-one thousand, five hundred fifty-seven".