216605756775 has 12 divisors (see below), whose sum is σ = 358121517992. Its totient is φ = 115523070240.

The previous prime is 216605756771. The next prime is 216605756831. The reversal of 216605756775 is 577657506612.

It is not a de Polignac number, because 216605756775 - 2² = 216605756771 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216605756771) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1444038304 + ... + 1444038453.

Almost surely, 2^216605756775 is an apocalyptic number.

216605756775 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

216605756775 is a deficient number, since it is larger than the sum of its proper divisors (141515761217).

216605756775 is a wasteful number, since it uses less digits than its factorization.

216605756775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2888076770 (or 2888076765 counting only the distinct ones).

The product of its (nonzero) digits is 18522000, while the sum is 57.

The spelling of 216605756775 in words is "two hundred sixteen billion, six hundred five million, seven hundred fifty-six thousand, seven hundred seventy-five".