550550403581 has 2 divisors, whose sum is σ = 550550403582. Its totient is φ = 550550403580.

The previous prime is 550550403527. The next prime is 550550403617. The reversal of 550550403581 is 185304055055.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 543589171225 + 6961232356 = 737285^2 + 83434^2 .

It is a cyclic number.

It is not a de Polignac number, because 550550403581 - 2¹⁸ = 550550141437 is a prime.

It is a super-2 number, since 2×550550403581² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (550550403881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 275275201790 + 275275201791.

It is an arithmetic number, because the mean of its divisors is an integer number (275275201791).

Almost surely, 2^550550403581 is an apocalyptic number.

It is an amenable number.

550550403581 is a deficient number, since it is larger than the sum of its proper divisors (1).

550550403581 is an equidigital number, since it uses as much as digits as its factorization.

550550403581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 300000, while the sum is 41.

The spelling of 550550403581 in words is "five hundred fifty billion, five hundred fifty million, four hundred three thousand, five hundred eighty-one".