216538273975 has 24 divisors (see below), whose sum is σ = 270290722608. Its totient is φ = 172080729600.

The previous prime is 216538273969. The next prime is 216538273981. The reversal of 216538273975 is 579372835612.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (216538273969) and next prime (216538273981).

It is not a de Polignac number, because 216538273975 - 2³ = 216538273967 is a prime.

It is a hoax number, since the sum of its digits (58) coincides with the sum of the digits of its distinct prime factors.

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 (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 26791935 + ... + 26800015.

It is an arithmetic number, because the mean of its divisors is an integer number (11262113442).

Almost surely, 2^216538273975 is an apocalyptic number.

216538273975 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

216538273975 is a deficient number, since it is larger than the sum of its proper divisors (53752448633).

216538273975 is a wasteful number, since it uses less digits than its factorization.

216538273975 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15075 (or 15070 counting only the distinct ones).

The product of its digits is 19051200, while the sum is 58.

The spelling of 216538273975 in words is "two hundred sixteen billion, five hundred thirty-eight million, two hundred seventy-three thousand, nine hundred seventy-five".