18349438051 has 4 divisors (see below), whose sum is σ = 20970786352. Its totient is φ = 15728089752.

The previous prime is 18349438039. The next prime is 18349438057. The reversal of 18349438051 is 15083494381.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15083494381 = 1549 ⋅9737569.

It is a cyclic number.

It is not a de Polignac number, because 18349438051 - 2⁷ = 18349437923 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18349437992 and 18349438010.

It is not an unprimeable number, because it can be changed into a prime (18349438057) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1310674140 + ... + 1310674153.

It is an arithmetic number, because the mean of its divisors is an integer number (5242696588).

Almost surely, 2^18349438051 is an apocalyptic number.

18349438051 is a deficient number, since it is larger than the sum of its proper divisors (2621348301).

18349438051 is an equidigital number, since it uses as much as digits as its factorization.

18349438051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2621348300.

The product of its (nonzero) digits is 414720, while the sum is 46.

The spelling of 18349438051 in words is "eighteen billion, three hundred forty-nine million, four hundred thirty-eight thousand, fifty-one".