18728478707 has 2 divisors, whose sum is σ = 18728478708. Its totient is φ = 18728478706.

The previous prime is 18728478697. The next prime is 18728478751. The reversal of 18728478707 is 70787482781.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (70787482781) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18728478707 - 2¹⁴ = 18728462323 is a prime.

It is not a weakly prime, because it can be changed into another prime (18728478407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9364239353 + 9364239354.

It is an arithmetic number, because the mean of its divisors is an integer number (9364239354).

Almost surely, 2^18728478707 is an apocalyptic number.

18728478707 is a deficient number, since it is larger than the sum of its proper divisors (1).

18728478707 is an equidigital number, since it uses as much as digits as its factorization.

18728478707 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9834496, while the sum is 59.

The spelling of 18728478707 in words is "eighteen billion, seven hundred twenty-eight million, four hundred seventy-eight thousand, seven hundred seven".