218040560641 has 4 divisors (see below), whose sum is σ = 220157459392. Its totient is φ = 215923661892.

The previous prime is 218040560567. The next prime is 218040560669. The reversal of 218040560641 is 146065040812.

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 218040560641 - 2⁷ = 218040560513 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 218040560641.

It is not an unprimeable number, because it can be changed into a prime (218040560041) 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, 1058449221 + ... + 1058449426.

It is an arithmetic number, because the mean of its divisors is an integer number (55039364848).

Almost surely, 2^218040560641 is an apocalyptic number.

It is an amenable number.

218040560641 is a deficient number, since it is larger than the sum of its proper divisors (2116898751).

218040560641 is a wasteful number, since it uses less digits than its factorization.

218040560641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2116898750.

The product of its (nonzero) digits is 46080, while the sum is 37.

The spelling of 218040560641 in words is "two hundred eighteen billion, forty million, five hundred sixty thousand, six hundred forty-one".