5531661361 has 2 divisors, whose sum is σ = 5531661362. Its totient is φ = 5531661360.

The previous prime is 5531661337. The next prime is 5531661371. The reversal of 5531661361 is 1631661355.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5531640625 + 20736 = 74375^2 + 144^2 .

It is a cyclic number.

It is not a de Polignac number, because 5531661361 - 2²³ = 5523272753 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 5531661361.

It is not a weakly prime, because it can be changed into another prime (5531661371) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2765830680 + 2765830681.

It is an arithmetic number, because the mean of its divisors is an integer number (2765830681).

Almost surely, 2^5531661361 is an apocalyptic number.

It is an amenable number.

5531661361 is a deficient number, since it is larger than the sum of its proper divisors (1).

5531661361 is an equidigital number, since it uses as much as digits as its factorization.

5531661361 is an evil number, because the sum of its binary digits is even.

The product of its digits is 48600, while the sum is 37.

The square root of 5531661361 is about 74375.1394015500. The cubic root of 5531661361 is about 1768.5548292834.

The spelling of 5531661361 in words is "five billion, five hundred thirty-one million, six hundred sixty-one thousand, three hundred sixty-one".