5550808909721 has 2 divisors, whose sum is σ = 5550808909722. Its totient is φ = 5550808909720.

The previous prime is 5550808909619. The next prime is 5550808909829. The reversal of 5550808909721 is 1279098080555.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5505499104400 + 45309805321 = 2346380^2 + 212861^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-5550808909721 is a prime.

It is a super-2 number, since 2×5550808909721² (a number of 26 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (5550801909721) 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 as a sum of consecutive naturals, namely, 2775404454860 + 2775404454861.

It is an arithmetic number, because the mean of its divisors is an integer number (2775404454861).

Almost surely, 2^{5550808909721} is an apocalyptic number.

It is an amenable number.

5550808909721 is a deficient number, since it is larger than the sum of its proper divisors (1).

5550808909721 is an equidigital number, since it uses as much as digits as its factorization.

5550808909721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9072000, while the sum is 59.

The spelling of 5550808909721 in words is "five trillion, five hundred fifty billion, eight hundred eight million, nine hundred nine thousand, seven hundred twenty-one".