218432137817923 has 2 divisors, whose sum is σ = 218432137817924. Its totient is φ = 218432137817922.

The previous prime is 218432137817849. The next prime is 218432137817969. The reversal of 218432137817923 is 329718731234812.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-218432137817923 is a prime.

It is not a weakly prime, because it can be changed into another prime (218432137812923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109216068908961 + 109216068908962.

It is an arithmetic number, because the mean of its divisors is an integer number (109216068908962).

Almost surely, 2^{218432137817923} is an apocalyptic number.

218432137817923 is a deficient number, since it is larger than the sum of its proper divisors (1).

218432137817923 is an equidigital number, since it uses as much as digits as its factorization.

218432137817923 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24385536, while the sum is 61.

The spelling of 218432137817923 in words is "two hundred eighteen trillion, four hundred thirty-two billion, one hundred thirty-seven million, eight hundred seventeen thousand, nine hundred twenty-three".