18148308718 has 4 divisors (see below), whose sum is σ = 27222463080. Its totient is φ = 9074154358.

The previous prime is 18148308697. The next prime is 18148308749. The reversal of 18148308718 is 81780384181.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 81780384181 = 877 ⋅93250153.

It is a super-2 number, since 2×18148308718² (a number of 21 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4537077178 + ... + 4537077181.

It is an arithmetic number, because the mean of its divisors is an integer number (6805615770).

Almost surely, 2^18148308718 is an apocalyptic number.

18148308718 is a deficient number, since it is larger than the sum of its proper divisors (9074154362).

18148308718 is an equidigital number, since it uses as much as digits as its factorization.

18148308718 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9074154361.

The product of its (nonzero) digits is 344064, while the sum is 49.

The spelling of 18148308718 in words is "eighteen billion, one hundred forty-eight million, three hundred eight thousand, seven hundred eighteen".