7851594493 has 6 divisors (see below), whose sum is σ = 7924300314. Its totient is φ = 7779549744.

The previous prime is 7851594467. The next prime is 7851594511. The reversal of 7851594493 is 3944951587.

It is a happy number.

7851594493 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 4563948249 + 3287646244 = 67557^2 + 57338^2 .

It is not a de Polignac number, because 7851594493 - 2⁵ = 7851594461 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 (7851594463) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 318546 + ... + 342307.

It is an arithmetic number, because the mean of its divisors is an integer number (1320716719).

Almost surely, 2^7851594493 is an apocalyptic number.

It is an amenable number.

7851594493 is a deficient number, since it is larger than the sum of its proper divisors (72705821).

7851594493 is an equidigital number, since it uses as much as digits as its factorization.

7851594493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 661071 (or 660962 counting only the distinct ones).

The product of its digits is 5443200, while the sum is 55.

The square root of 7851594493 is about 88609.2235210308. The cubic root of 7851594493 is about 1987.5556035128. Note that the first 3 decimals are identical.

The spelling of 7851594493 in words is "seven billion, eight hundred fifty-one million, five hundred ninety-four thousand, four hundred ninety-three".