1640775463 has 2 divisors, whose sum is σ = 1640775464. Its totient is φ = 1640775462.

The previous prime is 1640775413. The next prime is 1640775473. The reversal of 1640775463 is 3645770461.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1640775463 - 2¹⁷ = 1640644391 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1640775413) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 820387731 + 820387732.

It is an arithmetic number, because the mean of its divisors is an integer number (820387732).

Almost surely, 2^1640775463 is an apocalyptic number.

1640775463 is a deficient number, since it is larger than the sum of its proper divisors (1).

1640775463 is an equidigital number, since it uses as much as digits as its factorization.

1640775463 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 423360, while the sum is 43.

The square root of 1640775463 is about 40506.4866780618. The cubic root of 1640775463 is about 1179.4595492602.

The spelling of 1640775463 in words is "one billion, six hundred forty million, seven hundred seventy-five thousand, four hundred sixty-three".