18670666145 has 8 divisors (see below), whose sum is σ = 22428314856. Its totient is φ = 14920855936.

The previous prime is 18670666129. The next prime is 18670666187. The reversal of 18670666145 is 54166607681.

It can be written as a sum of positive squares in 4 ways, for example, as 219247249 + 18451418896 = 14807^2 + 135836^2 .

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 18670666145 - 2⁴ = 18670666129 is a prime.

It is a super-2 number, since 2×18670666145² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 18670666093 and 18670666102.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1954382 + ... + 1963911.

It is an arithmetic number, because the mean of its divisors is an integer number (2803539357).

Almost surely, 2^18670666145 is an apocalyptic number.

It is an amenable number.

18670666145 is a deficient number, since it is larger than the sum of its proper divisors (3757648711).

18670666145 is an equidigital number, since it uses as much as digits as its factorization.

18670666145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3919251.

The product of its (nonzero) digits is 1451520, while the sum is 50.

The spelling of 18670666145 in words is "eighteen billion, six hundred seventy million, six hundred sixty-six thousand, one hundred forty-five".