7908197945 has 4 divisors (see below), whose sum is σ = 9489837540. Its totient is φ = 6326558352.

The previous prime is 7908197911. The next prime is 7908197977. The reversal of 7908197945 is 5497918097.

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 907696384 + 7000501561 = 30128^2 + 83669^2 .

It is a cyclic number.

It is not a de Polignac number, because 7908197945 - 2¹⁰ = 7908196921 is a prime.

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 3 ways as a sum of consecutive naturals, for example, 790819790 + ... + 790819799.

It is an arithmetic number, because the mean of its divisors is an integer number (2372459385).

Almost surely, 2^7908197945 is an apocalyptic number.

It is an amenable number.

7908197945 is a deficient number, since it is larger than the sum of its proper divisors (1581639595).

7908197945 is a wasteful number, since it uses less digits than its factorization.

7908197945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1581639594.

The product of its (nonzero) digits is 5715360, while the sum is 59.

The square root of 7908197945 is about 88928.0492589374. The cubic root of 7908197945 is about 1992.3203781976.

The spelling of 7908197945 in words is "seven billion, nine hundred eight million, one hundred ninety-seven thousand, nine hundred forty-five".