556821357949 has 4 divisors (see below), whose sum is σ = 576022094460. Its totient is φ = 537620621440.

The previous prime is 556821357947. The next prime is 556821358057. The reversal of 556821357949 is 949753128655.

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 448340054724 + 108481303225 = 669582^2 + 329365^2 .

It is a cyclic number.

It is not a de Polignac number, because 556821357949 - 2¹ = 556821357947 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 (556821357947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9600368212 + ... + 9600368269.

It is an arithmetic number, because the mean of its divisors is an integer number (144005523615).

Almost surely, 2^556821357949 is an apocalyptic number.

It is an amenable number.

556821357949 is a deficient number, since it is larger than the sum of its proper divisors (19200736511).

556821357949 is a wasteful number, since it uses less digits than its factorization.

556821357949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19200736510.

The product of its digits is 81648000, while the sum is 64.

The spelling of 556821357949 in words is "five hundred fifty-six billion, eight hundred twenty-one million, three hundred fifty-seven thousand, nine hundred forty-nine".