18518034451 has 8 divisors (see below), whose sum is σ = 21613754880. Its totient is φ = 15534885768.

The previous prime is 18518034449. The next prime is 18518034473. The reversal of 18518034451 is 15443081581.

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

It is a cyclic number.

It is not a de Polignac number, because 18518034451 - 2¹ = 18518034449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18518034401) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28142581 + ... + 28143238.

It is an arithmetic number, because the mean of its divisors is an integer number (2701719360).

Almost surely, 2^18518034451 is an apocalyptic number.

18518034451 is a deficient number, since it is larger than the sum of its proper divisors (3095720429).

18518034451 is an equidigital number, since it uses as much as digits as its factorization.

18518034451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56285873.

The product of its (nonzero) digits is 76800, while the sum is 40.

The spelling of 18518034451 in words is "eighteen billion, five hundred eighteen million, thirty-four thousand, four hundred fifty-one".