18144520145751 has 4 divisors (see below), whose sum is σ = 24192693527672. Its totient is φ = 12096346763832.

The previous prime is 18144520145737. The next prime is 18144520145761. The reversal of 18144520145751 is 15754102544181.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 18144520145751 - 2⁷ = 18144520145623 is a prime.

It is a super-2 number, since 2×18144520145751² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18144520145751.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18144520145761) 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, 3024086690956 + ... + 3024086690961.

It is an arithmetic number, because the mean of its divisors is an integer number (6048173381918).

Almost surely, 2^{18144520145751} is an apocalyptic number.

18144520145751 is a deficient number, since it is larger than the sum of its proper divisors (6048173381921).

18144520145751 is an equidigital number, since it uses as much as digits as its factorization.

18144520145751 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6048173381920.

The product of its (nonzero) digits is 896000, while the sum is 48.

The spelling of 18144520145751 in words is "eighteen trillion, one hundred forty-four billion, five hundred twenty million, one hundred forty-five thousand, seven hundred fifty-one".