216727725031 has 4 divisors (see below), whose sum is σ = 216809296272. Its totient is φ = 216646153792.

The previous prime is 216727725023. The next prime is 216727725089. The reversal of 216727725031 is 130527727612.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 216727725031 - 2³ = 216727725023 is a prime.

It is a super-2 number, since 2×216727725031² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216727725091) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40781635 + ... + 40786948.

It is an arithmetic number, because the mean of its divisors is an integer number (54202324068).

Almost surely, 2^216727725031 is an apocalyptic number.

216727725031 is a deficient number, since it is larger than the sum of its proper divisors (81571241).

216727725031 is an equidigital number, since it uses as much as digits as its factorization.

216727725031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81571240.

The product of its (nonzero) digits is 246960, while the sum is 43.

The spelling of 216727725031 in words is "two hundred sixteen billion, seven hundred twenty-seven million, seven hundred twenty-five thousand, thirty-one".