1640116555 has 16 divisors (see below), whose sum is σ = 2453785344. Its totient is φ = 1022410080.

The previous prime is 1640116553. The next prime is 1640116561. The reversal of 1640116555 is 5556110461.

It is not a de Polignac number, because 1640116555 - 2¹ = 1640116553 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1640116555.

It is not an unprimeable number, because it can be changed into a prime (1640116553) 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 in 15 ways as a sum of consecutive naturals, for example, 2129637 + ... + 2130406.

It is an arithmetic number, because the mean of its divisors is an integer number (153361584).

Almost surely, 2^1640116555 is an apocalyptic number.

1640116555 is a deficient number, since it is larger than the sum of its proper divisors (813668789).

1640116555 is a wasteful number, since it uses less digits than its factorization.

1640116555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4260066.

The product of its (nonzero) digits is 18000, while the sum is 34.

The square root of 1640116555 is about 40498.3524973548. The cubic root of 1640116555 is about 1179.3016443744.

The spelling of 1640116555 in words is "one billion, six hundred forty million, one hundred sixteen thousand, five hundred fifty-five".