1640322055 has 8 divisors (see below), whose sum is σ = 2016396144. Its totient is φ = 1280251200.

The previous prime is 1640322049. The next prime is 1640322059. The reversal of 1640322055 is 5502230461.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-1640322055 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 (1640322059) 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 7 ways as a sum of consecutive naturals, for example, 4000581 + ... + 4000990.

It is an arithmetic number, because the mean of its divisors is an integer number (252049518).

Almost surely, 2^1640322055 is an apocalyptic number.

1640322055 is a deficient number, since it is larger than the sum of its proper divisors (376074089).

1640322055 is an equidigital number, since it uses as much as digits as its factorization.

1640322055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8001617.

The product of its (nonzero) digits is 7200, while the sum is 28.

The square root of 1640322055 is about 40500.8895581319. The cubic root of 1640322055 is about 1179.3508962331.

The spelling of 1640322055 in words is "one billion, six hundred forty million, three hundred twenty-two thousand, fifty-five".