7817195645 has 24 divisors (see below), whose sum is σ = 10930064184. Its totient is φ = 5351571456.

The previous prime is 7817195627. The next prime is 7817195657. The reversal of 7817195645 is 5465917187.

7817195645 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 4 ways, for example, as 83576164 + 7733619481 = 9142^2 + 87941^2 .

It is not a de Polignac number, because 7817195645 - 2¹⁶ = 7817130109 is a prime.

It is a super-2 number, since 2×7817195645² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 125309 + ... + 177021.

It is an arithmetic number, because the mean of its divisors is an integer number (455419341).

Almost surely, 2^7817195645 is an apocalyptic number.

It is an amenable number.

7817195645 is a deficient number, since it is larger than the sum of its proper divisors (3112868539).

7817195645 is a wasteful number, since it uses less digits than its factorization.

7817195645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52349 (or 52342 counting only the distinct ones).

The product of its digits is 2116800, while the sum is 53.

The square root of 7817195645 is about 88414.9062375796. The cubic root of 7817195645 is about 1984.6487751707.

The spelling of 7817195645 in words is "seven billion, eight hundred seventeen million, one hundred ninety-five thousand, six hundred forty-five".