216645535 has 8 divisors (see below), whose sum is σ = 275267376. Its totient is φ = 163121280.

The previous prime is 216645511. The next prime is 216645547. The reversal of 216645535 is 535546612.

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

It is a de Polignac number, because none of the positive numbers 2^k-216645535 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 216645494 and 216645503.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1274301 + ... + 1274470.

It is an arithmetic number, because the mean of its divisors is an integer number (34408422).

Almost surely, 2^216645535 is an apocalyptic number.

216645535 is a deficient number, since it is larger than the sum of its proper divisors (58621841).

216645535 is a wasteful number, since it uses less digits than its factorization.

216645535 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2548793.

The product of its digits is 108000, while the sum is 37.

The square root of 216645535 is about 14718.8836193510. The cubic root of 216645535 is about 600.5971231354.

The spelling of 216645535 in words is "two hundred sixteen million, six hundred forty-five thousand, five hundred thirty-five".