44555566661 has 2 divisors, whose sum is σ = 44555566662. Its totient is φ = 44555566660.

The previous prime is 44555566603. The next prime is 44555566669. The reversal of 44555566661 is 16666555544.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 44234081761 + 321484900 = 210319^2 + 17930^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-44555566661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (44555566669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22277783330 + 22277783331.

It is an arithmetic number, because the mean of its divisors is an integer number (22277783331).

Almost surely, 2^44555566661 is an apocalyptic number.

It is an amenable number.

44555566661 is a deficient number, since it is larger than the sum of its proper divisors (1).

44555566661 is an equidigital number, since it uses as much as digits as its factorization.

44555566661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12960000, while the sum is 53.

The spelling of 44555566661 in words is "forty-four billion, five hundred fifty-five million, five hundred sixty-six thousand, six hundred sixty-one".