1643316601445 has 16 divisors (see below), whose sum is σ = 2040045750000. Its totient is φ = 1269279019008.

The previous prime is 1643316601391. The next prime is 1643316601457. The reversal of 1643316601445 is 5441066133461.

It can be written as a sum of positive squares in 8 ways, for example, as 331187589121 + 1312129012324 = 575489^2 + 1145482^2 .

It is a cyclic number.

It is not a de Polignac number, because 1643316601445 - 2¹⁰ = 1643316600421 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1643316601396 and 1643316601405.

It is a congruent number.

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, 4725701 + ... + 5061509.

It is an arithmetic number, because the mean of its divisors is an integer number (127502859375).

Almost surely, 2^{1643316601445} is an apocalyptic number.

It is an amenable number.

1643316601445 is a deficient number, since it is larger than the sum of its proper divisors (396729148555).

1643316601445 is a wasteful number, since it uses less digits than its factorization.

1643316601445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 369592.

The product of its (nonzero) digits is 622080, while the sum is 44.

The spelling of 1643316601445 in words is "one trillion, six hundred forty-three billion, three hundred sixteen million, six hundred one thousand, four hundred forty-five".