217542514775 has 12 divisors (see below), whose sum is σ = 269758707552. Its totient is φ = 174030147840.

The previous prime is 217542514759. The next prime is 217542514781. The reversal of 217542514775 is 577415245712.

217542514775 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 217542514775 - 2⁴ = 217542514759 is a prime.

It is a Duffinian number.

It is a congruent number.

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 11 ways as a sum of consecutive naturals, for example, 1726727 + ... + 1848423.

It is an arithmetic number, because the mean of its divisors is an integer number (22479892296).

Almost surely, 2^217542514775 is an apocalyptic number.

217542514775 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

217542514775 is a deficient number, since it is larger than the sum of its proper divisors (52216192777).

217542514775 is a wasteful number, since it uses less digits than its factorization.

217542514775 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 193210 (or 193205 counting only the distinct ones).

The product of its digits is 2744000, while the sum is 50.

The spelling of 217542514775 in words is "two hundred seventeen billion, five hundred forty-two million, five hundred fourteen thousand, seven hundred seventy-five".