2311660643 has 4 divisors (see below), whose sum is σ = 2360844960. Its totient is φ = 2262476328.

The previous prime is 2311660597. The next prime is 2311660699. The reversal of 2311660643 is 3460661132.

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

It is a cyclic number.

It is not a de Polignac number, because 2311660643 - 2⁶ = 2311660579 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2311660543) 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 3 ways as a sum of consecutive naturals, for example, 24592088 + ... + 24592181.

It is an arithmetic number, because the mean of its divisors is an integer number (590211240).

Almost surely, 2^2311660643 is an apocalyptic number.

2311660643 is a deficient number, since it is larger than the sum of its proper divisors (49184317).

2311660643 is an equidigital number, since it uses as much as digits as its factorization.

2311660643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49184316.

The product of its (nonzero) digits is 15552, while the sum is 32.

The square root of 2311660643 is about 48079.7321435966. The cubic root of 2311660643 is about 1322.2331045894.

The spelling of 2311660643 in words is "two billion, three hundred eleven million, six hundred sixty thousand, six hundred forty-three".