441978521805 has 12 divisors (see below), whose sum is σ = 766096104540. Its totient is φ = 235721878272.

The previous prime is 441978521779. The next prime is 441978521819. The reversal of 441978521805 is 508125879144.

441978521805 is a `hidden beast` number, since 4 + 41 + 9 + 78 + 521 + 8 + 0 + 5 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 144523906569 + 297454615236 = 380163^2 + 545394^2 .

It is not a de Polignac number, because 441978521805 - 2¹⁸ = 441978259661 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4910872420 + ... + 4910872509.

It is an arithmetic number, because the mean of its divisors is an integer number (63841342045).

Almost surely, 2^441978521805 is an apocalyptic number.

441978521805 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

441978521805 is a deficient number, since it is larger than the sum of its proper divisors (324117582735).

441978521805 is a wasteful number, since it uses less digits than its factorization.

441978521805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9821744940 (or 9821744937 counting only the distinct ones).

The product of its (nonzero) digits is 3225600, while the sum is 54.

The spelling of 441978521805 in words is "four hundred forty-one billion, nine hundred seventy-eight million, five hundred twenty-one thousand, eight hundred five".