216156761 has 8 divisors (see below), whose sum is σ = 217311360. Its totient is φ = 215005968.

The previous prime is 216156757. The next prime is 216156763. The reversal of 216156761 is 167651612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 216156761 - 2² = 216156757 is a prime.

It is a super-2 number, since 2×216156761² = 93447490652022242, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (216156763) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 270815 + ... + 271611.

It is an arithmetic number, because the mean of its divisors is an integer number (27163920).

Almost surely, 2^216156761 is an apocalyptic number.

It is an amenable number.

216156761 is a deficient number, since it is larger than the sum of its proper divisors (1154599).

216156761 is an equidigital number, since it uses as much as digits as its factorization.

216156761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1903.

The product of its digits is 15120, while the sum is 35.

The square root of 216156761 is about 14702.2706069505. The cubic root of 216156761 is about 600.1451139745.

The spelling of 216156761 in words is "two hundred sixteen million, one hundred fifty-six thousand, seven hundred sixty-one".