1641333807945 has 56 divisors (see below), whose sum is σ = 3180207743496. Its totient is φ = 808041235968.

The previous prime is 1641333807937. The next prime is 1641333807947. The reversal of 1641333807945 is 5497083331461.

1641333807945 is a `hidden beast` number, since 1 + 64 + 133 + 380 + 79 + 4 + 5 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 35629205049 + 1605704602896 = 188757^2 + 1267164^2 .

It is not a de Polignac number, because 1641333807945 - 2³ = 1641333807937 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1641333807891 and 1641333807900.

It is not an unprimeable number, because it can be changed into a prime (1641333807947) 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 in 55 ways as a sum of consecutive naturals, for example, 17271744 + ... + 17366513.

It is an arithmetic number, because the mean of its divisors is an integer number (56789423991).

Almost surely, 2^{1641333807945} is an apocalyptic number.

1641333807945 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1641333807945 is a deficient number, since it is larger than the sum of its proper divisors (1538873935551).

1641333807945 is an equidigital number, since it uses as much as digits as its factorization.

1641333807945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34638293 (or 34638278 counting only the distinct ones).

The product of its (nonzero) digits is 6531840, while the sum is 54.

The spelling of 1641333807945 in words is "one trillion, six hundred forty-one billion, three hundred thirty-three million, eight hundred seven thousand, nine hundred forty-five".