1320071643 has 18 divisors (see below), whose sum is σ = 2095873052. Its totient is φ = 800042760.

The previous prime is 1320071611. The next prime is 1320071647. The reversal of 1320071643 is 3461700231.

1320071643 is a `hidden beast` number, since 13 + 2 + 0 + 0 + 7 + 1 + 643 = 666.

It is not a de Polignac number, because 1320071643 - 2⁵ = 1320071611 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1320071647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 605005 + ... + 607182.

Almost surely, 2^1320071643 is an apocalyptic number.

1320071643 is a deficient number, since it is larger than the sum of its proper divisors (775801409).

1320071643 is a wasteful number, since it uses less digits than its factorization.

1320071643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1212215 (or 1212201 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 27.

The square root of 1320071643 is about 36332.7901901299. The cubic root of 1320071643 is about 1096.9811559859.

Adding to 1320071643 its reverse (3461700231), we get a palindrome (4781771874).

The spelling of 1320071643 in words is "one billion, three hundred twenty million, seventy-one thousand, six hundred forty-three".