17975243977 has 2 divisors, whose sum is σ = 17975243978. Its totient is φ = 17975243976.

The previous prime is 17975243959. The next prime is 17975243983. The reversal of 17975243977 is 77934257971.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15626000016 + 2349243961 = 125004^2 + 48469^2 .

It is an emirp because it is prime and its reverse (77934257971) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 17975243977 - 2¹¹ = 17975241929 is a prime.

It is not a weakly prime, because it can be changed into another prime (17975243917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8987621988 + 8987621989.

It is an arithmetic number, because the mean of its divisors is an integer number (8987621989).

Almost surely, 2^17975243977 is an apocalyptic number.

It is an amenable number.

17975243977 is a deficient number, since it is larger than the sum of its proper divisors (1).

17975243977 is an equidigital number, since it uses as much as digits as its factorization.

17975243977 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 23337720, while the sum is 61.

It can be divided in two parts, 179752 and 43977, that added together give a square (223729 = 473²).

The spelling of 17975243977 in words is "seventeen billion, nine hundred seventy-five million, two hundred forty-three thousand, nine hundred seventy-seven".