556150611661 has 4 divisors (see below), whose sum is σ = 556264651932. Its totient is φ = 556036571392.

The previous prime is 556150611649. The next prime is 556150611689. The reversal of 556150611661 is 166116051655.

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 259392601636 + 296758010025 = 509306^2 + 544755^2 .

It is a cyclic number.

It is not a de Polignac number, because 556150611661 - 2⁵ = 556150611629 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 (556150611361) 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, 57012820 + ... + 57022573.

It is an arithmetic number, because the mean of its divisors is an integer number (139066162983).

Almost surely, 2^556150611661 is an apocalyptic number.

It is an amenable number.

556150611661 is a deficient number, since it is larger than the sum of its proper divisors (114040271).

556150611661 is a wasteful number, since it uses less digits than its factorization.

556150611661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114040270.

The product of its (nonzero) digits is 162000, while the sum is 43.

The spelling of 556150611661 in words is "five hundred fifty-six billion, one hundred fifty million, six hundred eleven thousand, six hundred sixty-one".