18128701645 has 4 divisors (see below), whose sum is σ = 21754441980. Its totient is φ = 14502961312.

The previous prime is 18128701627. The next prime is 18128701651. The reversal of 18128701645 is 54610782181.

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

It can be written as a sum of positive squares in 2 ways, for example, as 14247287044 + 3881414601 = 119362^2 + 62301^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18128701645 is a prime.

It is a super-3 number, since 3×18128701645³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1812870160 + ... + 1812870169.

It is an arithmetic number, because the mean of its divisors is an integer number (5438610495).

Almost surely, 2^18128701645 is an apocalyptic number.

It is an amenable number.

18128701645 is a deficient number, since it is larger than the sum of its proper divisors (3625740335).

18128701645 is an equidigital number, since it uses as much as digits as its factorization.

18128701645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3625740334.

The product of its (nonzero) digits is 107520, while the sum is 43.

The spelling of 18128701645 in words is "eighteen billion, one hundred twenty-eight million, seven hundred one thousand, six hundred forty-five".