218630673 has 6 divisors (see below), whose sum is σ = 315799874. Its totient is φ = 145753776.

The previous prime is 218630609. The next prime is 218630729. The reversal of 218630673 is 376036812.

It is a happy number.

218630673 is a `hidden beast` number, since 2 + 18 + 630 + 6 + 7 + 3 = 666.

It can be written as a sum of positive squares in only one way, i.e., 154181889 + 64448784 = 12417^2 + 8028^2 .

It is not a de Polignac number, because 218630673 - 2⁶ = 218630609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (218630173) 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, 12146140 + ... + 12146157.

Almost surely, 2^218630673 is an apocalyptic number.

It is an amenable number.

218630673 is a deficient number, since it is larger than the sum of its proper divisors (97169201).

218630673 is a wasteful number, since it uses less digits than its factorization.

218630673 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24292303 (or 24292300 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 36.

The square root of 218630673 is about 14786.1649185987. The cubic root of 218630673 is about 602.4259860988.

The spelling of 218630673 in words is "two hundred eighteen million, six hundred thirty thousand, six hundred seventy-three".