44166938727661 has 2 divisors, whose sum is σ = 44166938727662. Its totient is φ = 44166938727660.

The previous prime is 44166938727581. The next prime is 44166938727749. The reversal of 44166938727661 is 16672783966144.

44166938727661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 43431922284100 + 735016443561 = 6590290^2 + 857331^2 .

It is a cyclic number.

It is not a de Polignac number, because 44166938727661 - 2⁷ = 44166938727533 is a prime.

It is a super-2 number, since 2×44166938727661² (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 (44166938727761) 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, 22083469363830 + 22083469363831.

It is an arithmetic number, because the mean of its divisors is an integer number (22083469363831).

Almost surely, 2^{44166938727661} is an apocalyptic number.

It is an amenable number.

44166938727661 is a deficient number, since it is larger than the sum of its proper divisors (1).

44166938727661 is an equidigital number, since it uses as much as digits as its factorization.

44166938727661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 438939648, while the sum is 70.

The spelling of 44166938727661 in words is "forty-four trillion, one hundred sixty-six billion, nine hundred thirty-eight million, seven hundred twenty-seven thousand, six hundred sixty-one".