445555555555566 has 16 divisors (see below), whose sum is σ = 943529411764944. Its totient is φ = 139782135076224.

The previous prime is 445555555555547. The next prime is 445555555555601. The reversal of 445555555555566 is 665555555555544.

It is a happy number.

It is a plaindrome in base 10.

It is a zygodrome in base 10.

It is a congruent number.

It is an unprimeable number.

It is an upside-down number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2184095860465 + ... + 2184095860668.

It is an arithmetic number, because the mean of its divisors is an integer number (58970588235309).

Almost surely, 2^{445555555555566} is an apocalyptic number.

445555555555566 is an abundant number, since it is smaller than the sum of its proper divisors (497973856209378).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

445555555555566 is a wasteful number, since it uses less digits than its factorization.

445555555555566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4368191721155.

The product of its digits is 28125000000, while the sum is 75.

The spelling of 445555555555566 in words is "four hundred forty-five trillion, five hundred fifty-five billion, five hundred fifty-five million, five hundred fifty-five thousand, five hundred sixty-six".