218040559631 has 2 divisors, whose sum is σ = 218040559632. Its totient is φ = 218040559630.

The previous prime is 218040559571. The next prime is 218040559657. The reversal of 218040559631 is 136955040812.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 218040559631 - 2²⁶ = 217973450767 is a prime.

It is a super-2 number, since 2×218040559631² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (218040559661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109020279815 + 109020279816.

It is an arithmetic number, because the mean of its divisors is an integer number (109020279816).

Almost surely, 2^218040559631 is an apocalyptic number.

218040559631 is a deficient number, since it is larger than the sum of its proper divisors (1).

218040559631 is an equidigital number, since it uses as much as digits as its factorization.

218040559631 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 259200, while the sum is 44.

The spelling of 218040559631 in words is "two hundred eighteen billion, forty million, five hundred fifty-nine thousand, six hundred thirty-one".