1640323063 has 4 divisors (see below), whose sum is σ = 1640404480. Its totient is φ = 1640241648.

The previous prime is 1640323051. The next prime is 1640323093. The reversal of 1640323063 is 3603230461.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 3603230461 = 17 ⋅211954733.

It is a cyclic number.

It is not a de Polignac number, because 1640323063 - 2⁵ = 1640323031 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 (1640323033) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14203 + ... + 59011.

It is an arithmetic number, because the mean of its divisors is an integer number (410101120).

Almost surely, 2^1640323063 is an apocalyptic number.

1640323063 is a deficient number, since it is larger than the sum of its proper divisors (81417).

1640323063 is an equidigital number, since it uses as much as digits as its factorization.

1640323063 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81416.

The product of its (nonzero) digits is 7776, while the sum is 28.

The square root of 1640323063 is about 40500.9020023011. The cubic root of 1640323063 is about 1179.3511378088.

The spelling of 1640323063 in words is "one billion, six hundred forty million, three hundred twenty-three thousand, sixty-three".