117971315545 has 8 divisors (see below), whose sum is σ = 141592275720. Its totient is φ = 94359254400.

The previous prime is 117971315543. The next prime is 117971315563. The reversal of 117971315545 is 545513179711.

It can be written as a sum of positive squares in 4 ways, for example, as 13381168329 + 104590147216 = 115677^2 + 323404^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 117971315545 - 2¹ = 117971315543 is a prime.

It is not an unprimeable number, because it can be changed into a prime (117971315543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2195556 + ... + 2248645.

It is an arithmetic number, because the mean of its divisors is an integer number (17699034465).

Almost surely, 2^117971315545 is an apocalyptic number.

It is an amenable number.

117971315545 is a deficient number, since it is larger than the sum of its proper divisors (23620960175).

117971315545 is an equidigital number, since it uses as much as digits as its factorization.

117971315545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4449515.

The product of its digits is 661500, while the sum is 49.

The spelling of 117971315545 in words is "one hundred seventeen billion, nine hundred seventy-one million, three hundred fifteen thousand, five hundred forty-five".