44478971909 has 2 divisors, whose sum is σ = 44478971910. Its totient is φ = 44478971908.

The previous prime is 44478971891. The next prime is 44478971959. The reversal of 44478971909 is 90917987444.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 42053704900 + 2425267009 = 205070^2 + 49247^2 .

It is a cyclic number.

It is not a de Polignac number, because 44478971909 - 2³² = 40184004613 is a prime.

It is a super-2 number, since 2×44478971909² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (44478971959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22239485954 + 22239485955.

It is an arithmetic number, because the mean of its divisors is an integer number (22239485955).

Almost surely, 2^44478971909 is an apocalyptic number.

It is an amenable number.

44478971909 is a deficient number, since it is larger than the sum of its proper divisors (1).

44478971909 is an equidigital number, since it uses as much as digits as its factorization.

44478971909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18289152, while the sum is 62.

The spelling of 44478971909 in words is "forty-four billion, four hundred seventy-eight million, nine hundred seventy-one thousand, nine hundred nine".