1680365533 has 32 divisors (see below), whose sum is σ = 2199877632. Its totient is φ = 1244548800.

The previous prime is 1680365521. The next prime is 1680365539. The reversal of 1680365533 is 3355630861.

It is a de Polignac number, because none of the positive numbers 2^k-1680365533 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1680365539) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 285763 + ... + 291583.

It is an arithmetic number, because the mean of its divisors is an integer number (68746176).

Almost surely, 2^1680365533 is an apocalyptic number.

It is an amenable number.

1680365533 is a deficient number, since it is larger than the sum of its proper divisors (519512099).

1680365533 is a wasteful number, since it uses less digits than its factorization.

1680365533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6025.

The product of its (nonzero) digits is 194400, while the sum is 40.

The square root of 1680365533 is about 40992.2618673330. The cubic root of 1680365533 is about 1188.8706025393.

The spelling of 1680365533 in words is "one billion, six hundred eighty million, three hundred sixty-five thousand, five hundred thirty-three".