1640179811 has 2 divisors, whose sum is σ = 1640179812. Its totient is φ = 1640179810.

The previous prime is 1640179787. The next prime is 1640179823. The reversal of 1640179811 is 1189710461.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1640179811 - 2⁶ = 1640179747 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (1640179861) 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, 820089905 + 820089906.

It is an arithmetic number, because the mean of its divisors is an integer number (820089906).

Almost surely, 2^1640179811 is an apocalyptic number.

1640179811 is a deficient number, since it is larger than the sum of its proper divisors (1).

1640179811 is an equidigital number, since it uses as much as digits as its factorization.

1640179811 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12096, while the sum is 38.

The square root of 1640179811 is about 40499.1334598655. The cubic root of 1640179811 is about 1179.3168052777.

The spelling of 1640179811 in words is "one billion, six hundred forty million, one hundred seventy-nine thousand, eight hundred eleven".