216772775 has 12 divisors (see below), whose sum is σ = 270196992. Its totient is φ = 172515840.

The previous prime is 216772681. The next prime is 216772783. The reversal of 216772775 is 577277612.

It is not a de Polignac number, because 216772775 - 2⁸ = 216772519 is a prime.

It is a hoax number, since the sum of its digits (44) 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 polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17639 + ... + 27288.

It is an arithmetic number, because the mean of its divisors is an integer number (22516416).

Almost surely, 2^216772775 is an apocalyptic number.

216772775 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

216772775 is a deficient number, since it is larger than the sum of its proper divisors (53424217).

216772775 is a wasteful number, since it uses less digits than its factorization.

216772775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45130 (or 45125 counting only the distinct ones).

The product of its digits is 288120, while the sum is 44.

The square root of 216772775 is about 14723.2053235700. The cubic root of 216772775 is about 600.7146807884.

The spelling of 216772775 in words is "two hundred sixteen million, seven hundred seventy-two thousand, seven hundred seventy-five".