1938321824545 has 16 divisors (see below), whose sum is σ = 2433228498000. Its totient is φ = 1480364182528.

The previous prime is 1938321824471. The next prime is 1938321824567. The reversal of 1938321824545 is 5454281238391.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 204904696896 + 1733417127649 = 452664^2 + 1316593^2 .

It is a cyclic number.

It is not a de Polignac number, because 1938321824545 - 2¹⁹ = 1938321300257 is a prime.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 75086740 + ... + 75112549.

It is an arithmetic number, because the mean of its divisors is an integer number (152076781125).

Almost surely, 2^{1938321824545} is an apocalyptic number.

It is an amenable number.

1938321824545 is a deficient number, since it is larger than the sum of its proper divisors (494906673455).

1938321824545 is a wasteful number, since it uses less digits than its factorization.

1938321824545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150199412.

The product of its digits is 8294400, while the sum is 55.

The spelling of 1938321824545 in words is "one trillion, nine hundred thirty-eight billion, three hundred twenty-one million, eight hundred twenty-four thousand, five hundred forty-five".