218119977 has 6 divisors (see below), whose sum is σ = 315062202. Its totient is φ = 145413312.

The previous prime is 218119969. The next prime is 218120011. The reversal of 218119977 is 779911812.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 172029456 + 46090521 = 13116^2 + 6789^2 .

It is not a de Polignac number, because 218119977 - 2³ = 218119969 is a prime.

It is not an unprimeable number, because it can be changed into a prime (218119927) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12117768 + ... + 12117785.

It is an arithmetic number, because the mean of its divisors is an integer number (52510367).

Almost surely, 2^218119977 is an apocalyptic number.

It is an amenable number.

218119977 is a deficient number, since it is larger than the sum of its proper divisors (96942225).

218119977 is a wasteful number, since it uses less digits than its factorization.

218119977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24235559 (or 24235556 counting only the distinct ones).

The product of its digits is 63504, while the sum is 45.

The square root of 218119977 is about 14768.8854352656. The cubic root of 218119977 is about 601.9565545554.

The spelling of 218119977 in words is "two hundred eighteen million, one hundred nineteen thousand, nine hundred seventy-seven".