2068604004491 has 4 divisors (see below), whose sum is σ = 2074240528032. Its totient is φ = 2062967480952.

The previous prime is 2068604004457. The next prime is 2068604004521. The reversal of 2068604004491 is 1944004068602.

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 2068604004491 - 2³⁰ = 2067530262667 is a prime.

It is a super-2 number, since 2×2068604004491² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2068604004391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2818261220 + ... + 2818261953.

It is an arithmetic number, because the mean of its divisors is an integer number (518560132008).

Almost surely, 2^{2068604004491} is an apocalyptic number.

2068604004491 is a deficient number, since it is larger than the sum of its proper divisors (5636523541).

2068604004491 is an equidigital number, since it uses as much as digits as its factorization.

2068604004491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5636523540.

The product of its (nonzero) digits is 331776, while the sum is 44.

The spelling of 2068604004491 in words is "two trillion, sixty-eight billion, six hundred four million, four thousand, four hundred ninety-one".