4278638926993 has 4 divisors (see below), whose sum is σ = 4279221141300. Its totient is φ = 4278056712688.

The previous prime is 4278638926981. The next prime is 4278638926997. The reversal of 4278638926993 is 3996298368724.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1605207913024 + 2673431013969 = 1266968^2 + 1635063^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4278638926993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4278638926997) 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, 291096130 + ... + 291110827.

It is an arithmetic number, because the mean of its divisors is an integer number (1069805285325).

Almost surely, 2^{4278638926993} is an apocalyptic number.

It is an amenable number.

4278638926993 is a deficient number, since it is larger than the sum of its proper divisors (582214307).

4278638926993 is an equidigital number, since it uses as much as digits as its factorization.

4278638926993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 582214306.

The product of its digits is 1693052928, while the sum is 76.

The spelling of 4278638926993 in words is "four trillion, two hundred seventy-eight billion, six hundred thirty-eight million, nine hundred twenty-six thousand, nine hundred ninety-three".