6666015145 has 4 divisors (see below), whose sum is σ = 7999218180. Its totient is φ = 5332812112.

The previous prime is 6666015091. The next prime is 6666015199. The reversal of 6666015145 is 5415106666.

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

It is an interprime number because it is at equal distance from previous prime (6666015091) and next prime (6666015199).

It can be written as a sum of positive squares in 2 ways, for example, as 3721976064 + 2944039081 = 61008^2 + 54259^2 .

It is a cyclic number.

It is not a de Polignac number, because 6666015145 - 2¹³ = 6666006953 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 6666015098 and 6666015107.

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, 666601510 + ... + 666601519.

It is an arithmetic number, because the mean of its divisors is an integer number (1999804545).

Almost surely, 2^6666015145 is an apocalyptic number.

It is an amenable number.

6666015145 is a deficient number, since it is larger than the sum of its proper divisors (1333203035).

6666015145 is a wasteful number, since it uses less digits than its factorization.

6666015145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1333203034.

The product of its (nonzero) digits is 129600, while the sum is 40.

The square root of 6666015145 is about 81645.6682561910. The cubic root of 6666015145 is about 1882.0107452285.

The spelling of 6666015145 in words is "six billion, six hundred sixty-six million, fifteen thousand, one hundred forty-five".