1640432579 has 2 divisors, whose sum is σ = 1640432580. Its totient is φ = 1640432578.

The previous prime is 1640432533. The next prime is 1640432617. The reversal of 1640432579 is 9752340461.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1640432579 - 2¹² = 1640428483 is a prime.

It is a zygodrome in base 2.

It is not a weakly prime, because it can be changed into another prime (1640432179) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 820216289 + 820216290.

It is an arithmetic number, because the mean of its divisors is an integer number (820216290).

Almost surely, 2^1640432579 is an apocalyptic number.

1640432579 is a deficient number, since it is larger than the sum of its proper divisors (1).

1640432579 is an equidigital number, since it uses as much as digits as its factorization.

1640432579 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 181440, while the sum is 41.

The square root of 1640432579 is about 40502.2539990060. The cubic root of 1640432579 is about 1179.3773836437.

The spelling of 1640432579 in words is "one billion, six hundred forty million, four hundred thirty-two thousand, five hundred seventy-nine".