216777377 has 4 divisors (see below), whose sum is σ = 217041600. Its totient is φ = 216513156.

The previous prime is 216777371. The next prime is 216777409. The reversal of 216777377 is 773777612.

216777377 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 not a de Polignac number, because 216777377 - 2⁶ = 216777313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216777371) 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, 130877 + ... + 132522.

It is an arithmetic number, because the mean of its divisors is an integer number (54260400).

Almost surely, 2^216777377 is an apocalyptic number.

It is an amenable number.

216777377 is a deficient number, since it is larger than the sum of its proper divisors (264223).

216777377 is an equidigital number, since it uses as much as digits as its factorization.

216777377 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 264222.

The product of its digits is 605052, while the sum is 47.

The square root of 216777377 is about 14723.3616066440. The cubic root of 216777377 is about 600.7189317364.

The spelling of 216777377 in words is "two hundred sixteen million, seven hundred seventy-seven thousand, three hundred seventy-seven".