556535221161 has 4 divisors (see below), whose sum is σ = 742046961552. Its totient is φ = 371023480772.

The previous prime is 556535221159. The next prime is 556535221163. The reversal of 556535221161 is 161122535655.

It is a happy number.

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 an interprime number because it is at equal distance from previous prime (556535221159) and next prime (556535221163).

It is a cyclic number.

It is not a de Polignac number, because 556535221161 - 2¹ = 556535221159 is a prime.

It is not an unprimeable number, because it can be changed into a prime (556535221163) 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, 92755870191 + ... + 92755870196.

It is an arithmetic number, because the mean of its divisors is an integer number (185511740388).

Almost surely, 2^556535221161 is an apocalyptic number.

It is an amenable number.

556535221161 is a deficient number, since it is larger than the sum of its proper divisors (185511740391).

556535221161 is a wasteful number, since it uses less digits than its factorization.

556535221161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 185511740390.

The product of its digits is 270000, while the sum is 42.

The spelling of 556535221161 in words is "five hundred fifty-six billion, five hundred thirty-five million, two hundred twenty-one thousand, one hundred sixty-one".