555561050621 has 2 divisors, whose sum is σ = 555561050622. Its totient is φ = 555561050620.

The previous prime is 555561050609. The next prime is 555561050663. The reversal of 555561050621 is 126050165555.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 353792988025 + 201768062596 = 594805^2 + 449186^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-555561050621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (555561050321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 277780525310 + 277780525311.

It is an arithmetic number, because the mean of its divisors is an integer number (277780525311).

Almost surely, 2^555561050621 is an apocalyptic number.

It is an amenable number.

555561050621 is a deficient number, since it is larger than the sum of its proper divisors (1).

555561050621 is an equidigital number, since it uses as much as digits as its factorization.

555561050621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 225000, while the sum is 41.

The spelling of 555561050621 in words is "five hundred fifty-five billion, five hundred sixty-one million, fifty thousand, six hundred twenty-one".