216334555777 has 4 divisors (see below), whose sum is σ = 216336531456. Its totient is φ = 216332580100.

The previous prime is 216334555753. The next prime is 216334555817. The reversal of 216334555777 is 777555433612.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-216334555777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216334595777) 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, 813313 + ... + 1046014.

It is an arithmetic number, because the mean of its divisors is an integer number (54084132864).

Almost surely, 2^216334555777 is an apocalyptic number.

It is an amenable number.

216334555777 is a deficient number, since it is larger than the sum of its proper divisors (1975679).

216334555777 is a wasteful number, since it uses less digits than its factorization.

216334555777 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1975678.

The product of its digits is 18522000, while the sum is 55.

It can be divided in two parts, 2163345 and 55777, that added together give a palindrome (2219122).

The spelling of 216334555777 in words is "two hundred sixteen billion, three hundred thirty-four million, five hundred fifty-five thousand, seven hundred seventy-seven".