17871143977 has 2 divisors, whose sum is σ = 17871143978. Its totient is φ = 17871143976.

The previous prime is 17871143881. The next prime is 17871143981. The reversal of 17871143977 is 77934117871.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16003262016 + 1867881961 = 126504^2 + 43219^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-17871143977 is a prime.

It is not a weakly prime, because it can be changed into another prime (17871143677) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8935571988 + 8935571989.

It is an arithmetic number, because the mean of its divisors is an integer number (8935571989).

Almost surely, 2^17871143977 is an apocalyptic number.

It is an amenable number.

17871143977 is a deficient number, since it is larger than the sum of its proper divisors (1).

17871143977 is an equidigital number, since it uses as much as digits as its factorization.

17871143977 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2074464, while the sum is 55.

The spelling of 17871143977 in words is "seventeen billion, eight hundred seventy-one million, one hundred forty-three thousand, nine hundred seventy-seven".