18500000051 has 8 divisors (see below), whose sum is σ = 20203684704. Its totient is φ = 16836402240.

The previous prime is 18500000023. The next prime is 18500000059. The reversal of 18500000051 is 15000000581.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18500000051 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18499999969 and 18500000032.

It is not an unprimeable number, because it can be changed into a prime (18500000059) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10020746 + ... + 10022591.

It is an arithmetic number, because the mean of its divisors is an integer number (2525460588).

Almost surely, 2^18500000051 is an apocalyptic number.

18500000051 is a deficient number, since it is larger than the sum of its proper divisors (1703684653).

18500000051 is a wasteful number, since it uses less digits than its factorization.

18500000051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20043421.

The product of its (nonzero) digits is 200, while the sum is 20.

The spelling of 18500000051 in words is "eighteen billion, five hundred million, fifty-one", and thus it is an aban number.