555555541621 has 4 divisors (see below), whose sum is σ = 555731186752. Its totient is φ = 555379896492.

The previous prime is 555555541603. The next prime is 555555541637. The reversal of 555555541621 is 126145555555.

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 555555541621 - 2¹¹ = 555555539573 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 (555555542621) 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, 87817821 + ... + 87824146.

It is an arithmetic number, because the mean of its divisors is an integer number (138932796688).

Almost surely, 2^555555541621 is an apocalyptic number.

It is an amenable number.

555555541621 is a deficient number, since it is larger than the sum of its proper divisors (175645131).

555555541621 is a wasteful number, since it uses less digits than its factorization.

555555541621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 175645130.

The product of its digits is 3750000, while the sum is 49.

The spelling of 555555541621 in words is "five hundred fifty-five billion, five hundred fifty-five million, five hundred forty-one thousand, six hundred twenty-one".