5553081661 has 2 divisors, whose sum is σ = 5553081662. Its totient is φ = 5553081660.

The previous prime is 5553081649. The next prime is 5553081673. The reversal of 5553081661 is 1661803555.

It is a balanced prime because it is at equal distance from previous prime (5553081649) and next prime (5553081673).

It can be written as a sum of positive squares in only one way, i.e., 5525097561 + 27984100 = 74331^2 + 5290^2 .

It is a cyclic number.

It is not a de Polignac number, because 5553081661 - 2¹³ = 5553073469 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5553081601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2776540830 + 2776540831.

It is an arithmetic number, because the mean of its divisors is an integer number (2776540831).

Almost surely, 2^5553081661 is an apocalyptic number.

It is an amenable number.

5553081661 is a deficient number, since it is larger than the sum of its proper divisors (1).

5553081661 is an equidigital number, since it uses as much as digits as its factorization.

5553081661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108000, while the sum is 40.

The square root of 5553081661 is about 74519.0020129094. The cubic root of 5553081661 is about 1770.8346857480.

The spelling of 5553081661 in words is "five billion, five hundred fifty-three million, eighty-one thousand, six hundred sixty-one".