218656400413 has 4 divisors (see below), whose sum is σ = 238534255008. Its totient is φ = 198778545820.

The previous prime is 218656400411. The next prime is 218656400449. The reversal of 218656400413 is 314004656812.

It is a happy number.

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 218656400413 - 2¹ = 218656400411 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218656400411) 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, 9938927281 + ... + 9938927302.

It is an arithmetic number, because the mean of its divisors is an integer number (59633563752).

Almost surely, 2^218656400413 is an apocalyptic number.

It is an amenable number.

218656400413 is a deficient number, since it is larger than the sum of its proper divisors (19877854595).

218656400413 is a wasteful number, since it uses less digits than its factorization.

218656400413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19877854594.

The product of its (nonzero) digits is 138240, while the sum is 40.

The spelling of 218656400413 in words is "two hundred eighteen billion, six hundred fifty-six million, four hundred thousand, four hundred thirteen".