8180905357 has 4 divisors (see below), whose sum is σ = 8380439676. Its totient is φ = 7981371040.

The previous prime is 8180905339. The next prime is 8180905391. The reversal of 8180905357 is 7535090818.

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 3488792356 + 4692113001 = 59066^2 + 68499^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8180905357 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 (8180905457) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 99767098 + ... + 99767179.

It is an arithmetic number, because the mean of its divisors is an integer number (2095109919).

Almost surely, 2^8180905357 is an apocalyptic number.

It is an amenable number.

8180905357 is a deficient number, since it is larger than the sum of its proper divisors (199534319).

8180905357 is a wasteful number, since it uses less digits than its factorization.

8180905357 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199534318.

The product of its (nonzero) digits is 302400, while the sum is 46.

The square root of 8180905357 is about 90448.3574035482. The cubic root of 8180905357 is about 2014.9632182799.

The spelling of 8180905357 in words is "eight billion, one hundred eighty million, nine hundred five thousand, three hundred fifty-seven".