218138402977 has 8 divisors (see below), whose sum is σ = 237999357792. Its totient is φ = 198282480000.

The previous prime is 218138402959. The next prime is 218138403023. The reversal of 218138402977 is 779204831812.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 218138402977 - 2¹⁵ = 218138370209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (218138402927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1167024 + ... + 1340977.

It is an arithmetic number, because the mean of its divisors is an integer number (29749919724).

Almost surely, 2^218138402977 is an apocalyptic number.

It is an amenable number.

218138402977 is a deficient number, since it is larger than the sum of its proper divisors (19860954815).

218138402977 is a wasteful number, since it uses less digits than its factorization.

218138402977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2515919.

The product of its (nonzero) digits is 1354752, while the sum is 52.

The spelling of 218138402977 in words is "two hundred eighteen billion, one hundred thirty-eight million, four hundred two thousand, nine hundred seventy-seven".