44198686781 has 2 divisors, whose sum is σ = 44198686782. Its totient is φ = 44198686780.

The previous prime is 44198686729. The next prime is 44198686783. The reversal of 44198686781 is 18768689144.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 34184681881 + 10014004900 = 184891^2 + 100070^2 .

It is a cyclic number.

It is not a de Polignac number, because 44198686781 - 2³⁰ = 43124944957 is a prime.

It is a super-2 number, since 2×44198686781² (a number of 22 digits) contains 22 as substring.

Together with 44198686783, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (44198686783) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22099343390 + 22099343391.

It is an arithmetic number, because the mean of its divisors is an integer number (22099343391).

Almost surely, 2^44198686781 is an apocalyptic number.

It is an amenable number.

44198686781 is a deficient number, since it is larger than the sum of its proper divisors (1).

44198686781 is an equidigital number, since it uses as much as digits as its factorization.

44198686781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18579456, while the sum is 62.

The spelling of 44198686781 in words is "forty-four billion, one hundred ninety-eight million, six hundred eighty-six thousand, seven hundred eighty-one".