6550656616081 has 2 divisors, whose sum is σ = 6550656616082. Its totient is φ = 6550656616080.

The previous prime is 6550656616027. The next prime is 6550656616181. The reversal of 6550656616081 is 1806166560556.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4010486864400 + 2540169751681 = 2002620^2 + 1593791^2 .

It is a cyclic number.

It is not a de Polignac number, because 6550656616081 - 2⁷ = 6550656615953 is a prime.

It is a super-2 number, since 2×6550656616081² (a number of 26 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (6550656616181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3275328308040 + 3275328308041.

It is an arithmetic number, because the mean of its divisors is an integer number (3275328308041).

Almost surely, 2^{6550656616081} is an apocalyptic number.

It is an amenable number.

6550656616081 is a deficient number, since it is larger than the sum of its proper divisors (1).

6550656616081 is an equidigital number, since it uses as much as digits as its factorization.

6550656616081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7776000, while the sum is 55.

The spelling of 6550656616081 in words is "six trillion, five hundred fifty billion, six hundred fifty-six million, six hundred sixteen thousand, eighty-one".