1640464559 has 2 divisors, whose sum is σ = 1640464560. Its totient is φ = 1640464558.

The previous prime is 1640464537. The next prime is 1640464601. The reversal of 1640464559 is 9554640461.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1640464559 - 2¹⁶ = 1640399023 is a prime.

It is a super-2 number, since 2×1640464559² = 5382247938670128962, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1640464459) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 820232279 + 820232280.

It is an arithmetic number, because the mean of its divisors is an integer number (820232280).

Almost surely, 2^1640464559 is an apocalyptic number.

1640464559 is a deficient number, since it is larger than the sum of its proper divisors (1).

1640464559 is an equidigital number, since it uses as much as digits as its factorization.

1640464559 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 518400, while the sum is 44.

The square root of 1640464559 is about 40502.6487899248. The cubic root of 1640464559 is about 1179.3850475254.

The spelling of 1640464559 in words is "one billion, six hundred forty million, four hundred sixty-four thousand, five hundred fifty-nine".