55771050552661 has 2 divisors, whose sum is σ = 55771050552662. Its totient is φ = 55771050552660.

The previous prime is 55771050552577. The next prime is 55771050552683. The reversal of 55771050552661 is 16625505017755.

It is a happy number.

55771050552661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 52813562082436 + 2957488470225 = 7267294^2 + 1719735^2 .

It is a cyclic number.

It is not a de Polignac number, because 55771050552661 - 2¹⁷ = 55771050421589 is a prime.

It is a super-2 number, since 2×55771050552661² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55771050553661) 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, 27885525276330 + 27885525276331.

It is an arithmetic number, because the mean of its divisors is an integer number (27885525276331).

Almost surely, 2^{55771050552661} is an apocalyptic number.

It is an amenable number.

55771050552661 is a deficient number, since it is larger than the sum of its proper divisors (1).

55771050552661 is an equidigital number, since it uses as much as digits as its factorization.

55771050552661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11025000, while the sum is 55.

The spelling of 55771050552661 in words is "fifty-five trillion, seven hundred seventy-one billion, fifty million, five hundred fifty-two thousand, six hundred sixty-one".