18219948707 has 2 divisors, whose sum is σ = 18219948708. Its totient is φ = 18219948706.

The previous prime is 18219948671. The next prime is 18219948763. The reversal of 18219948707 is 70784991281.

It is an a-pointer prime, because the next prime (18219948763) can be obtained adding 18219948707 to its sum of digits (56).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18219948707 - 2²⁴ = 18203171491 is a prime.

It is not a weakly prime, because it can be changed into another prime (18219948767) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9109974353 + 9109974354.

It is an arithmetic number, because the mean of its divisors is an integer number (9109974354).

Almost surely, 2^18219948707 is an apocalyptic number.

18219948707 is a deficient number, since it is larger than the sum of its proper divisors (1).

18219948707 is an equidigital number, since it uses as much as digits as its factorization.

18219948707 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2032128, while the sum is 56.

The spelling of 18219948707 in words is "eighteen billion, two hundred nineteen million, nine hundred forty-eight thousand, seven hundred seven".