1640943359999 has 4 divisors (see below), whose sum is σ = 1646219705520. Its totient is φ = 1635667014480.

The previous prime is 1640943359987. The next prime is 1640943360011. The reversal of 1640943359999 is 9999533490461.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (1640943359987) and next prime (1640943360011).

It is a cyclic number.

It is not a de Polignac number, because 1640943359999 - 2⁸ = 1640943359743 is a prime.

It is a super-2 number, since 2×1640943359999² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1640943359969) 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, 2638172294 + ... + 2638172915.

It is an arithmetic number, because the mean of its divisors is an integer number (411554926380).

Almost surely, 2^{1640943359999} is an apocalyptic number.

1640943359999 is a deficient number, since it is larger than the sum of its proper divisors (5276345521).

1640943359999 is an equidigital number, since it uses as much as digits as its factorization.

1640943359999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5276345520.

The product of its (nonzero) digits is 255091680, while the sum is 71.

The spelling of 1640943359999 in words is "one trillion, six hundred forty billion, nine hundred forty-three million, three hundred fifty-nine thousand, nine hundred ninety-nine".