5551561205623 has 4 divisors (see below), whose sum is σ = 5553073484208. Its totient is φ = 5550048927040.

The previous prime is 5551561205579. The next prime is 5551561205669. The reversal of 5551561205623 is 3265021651555.

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

It is a cyclic number.

It is not a de Polignac number, because 5551561205623 - 2¹⁷ = 5551561074551 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 (5551561205023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 756133786 + ... + 756141127.

It is an arithmetic number, because the mean of its divisors is an integer number (1388268371052).

Almost surely, 2^{5551561205623} is an apocalyptic number.

5551561205623 is a deficient number, since it is larger than the sum of its proper divisors (1512278585).

5551561205623 is a wasteful number, since it uses less digits than its factorization.

5551561205623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1512278584.

The product of its (nonzero) digits is 1350000, while the sum is 46.

The spelling of 5551561205623 in words is "five trillion, five hundred fifty-one billion, five hundred sixty-one million, two hundred five thousand, six hundred twenty-three".