18218196907 has 2 divisors, whose sum is σ = 18218196908. Its totient is φ = 18218196906.

The previous prime is 18218196883. The next prime is 18218196959. The reversal of 18218196907 is 70969181281.

It is an a-pointer prime, because the next prime (18218196959) can be obtained adding 18218196907 to its sum of digits (52).

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18218196907 is a prime.

It is not a weakly prime, because it can be changed into another prime (18218116907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9109098453 + 9109098454.

It is an arithmetic number, because the mean of its divisors is an integer number (9109098454).

Almost surely, 2^18218196907 is an apocalyptic number.

18218196907 is a deficient number, since it is larger than the sum of its proper divisors (1).

18218196907 is an equidigital number, since it uses as much as digits as its factorization.

18218196907 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 435456, while the sum is 52.

The spelling of 18218196907 in words is "eighteen billion, two hundred eighteen million, one hundred ninety-six thousand, nine hundred seven".