1640633611 has 2 divisors, whose sum is σ = 1640633612. Its totient is φ = 1640633610.

The previous prime is 1640633549. The next prime is 1640633663. The reversal of 1640633611 is 1163360461.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1640633611 - 2⁷ = 1640633483 is a prime.

It is not a weakly prime, because it can be changed into another prime (1640633681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 820316805 + 820316806.

It is an arithmetic number, because the mean of its divisors is an integer number (820316806).

Almost surely, 2^1640633611 is an apocalyptic number.

1640633611 is a deficient number, since it is larger than the sum of its proper divisors (1).

1640633611 is an equidigital number, since it uses as much as digits as its factorization.

1640633611 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7776, while the sum is 31.

The square root of 1640633611 is about 40504.7356614014. The cubic root of 1640633611 is about 1179.4255585200.

The spelling of 1640633611 in words is "one billion, six hundred forty million, six hundred thirty-three thousand, six hundred eleven".