1640133533 has 2 divisors, whose sum is σ = 1640133534. Its totient is φ = 1640133532.

The previous prime is 1640133403. The next prime is 1640133569. The reversal of 1640133533 is 3353310461.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1061586724 + 578546809 = 32582^2 + 24053^2 .

It is a cyclic number.

It is not a de Polignac number, because 1640133533 - 2⁸ = 1640133277 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1640133496 and 1640133505.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1640183533) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 820066766 + 820066767.

It is an arithmetic number, because the mean of its divisors is an integer number (820066767).

Almost surely, 2^1640133533 is an apocalyptic number.

It is an amenable number.

1640133533 is a deficient number, since it is larger than the sum of its proper divisors (1).

1640133533 is an equidigital number, since it uses as much as digits as its factorization.

1640133533 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9720, while the sum is 29.

The square root of 1640133533 is about 40498.5621102774. The cubic root of 1640133533 is about 1179.3057136206.

Adding to 1640133533 its reverse (3353310461), we get a palindrome (4993443994).

The spelling of 1640133533 in words is "one billion, six hundred forty million, one hundred thirty-three thousand, five hundred thirty-three".