1640016559 has 4 divisors (see below), whose sum is σ = 1726333240. Its totient is φ = 1553699880.

The previous prime is 1640016551. The next prime is 1640016563. The reversal of 1640016559 is 9556100461.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9556100461 = 41 ⋅233075621.

It is a cyclic number.

It is not a de Polignac number, because 1640016559 - 2³ = 1640016551 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1640016551) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43158312 + ... + 43158349.

It is an arithmetic number, because the mean of its divisors is an integer number (431583310).

Almost surely, 2^1640016559 is an apocalyptic number.

1640016559 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

1640016559 is a deficient number, since it is larger than the sum of its proper divisors (86316681).

1640016559 is an equidigital number, since it uses as much as digits as its factorization.

1640016559 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86316680.

The product of its (nonzero) digits is 32400, while the sum is 37.

The square root of 1640016559 is about 40497.1179097970. The cubic root of 1640016559 is about 1179.2776770037.

The spelling of 1640016559 in words is "one billion, six hundred forty million, sixteen thousand, five hundred fifty-nine".