666036145 has 4 divisors (see below), whose sum is σ = 799243380. Its totient is φ = 532828912.

The previous prime is 666036097. The next prime is 666036187. The reversal of 666036145 is 541630666.

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 384199201 + 281836944 = 19601^2 + 16788^2 .

It is a cyclic number.

It is not a de Polignac number, because 666036145 - 2¹⁷ = 665905073 is a prime.

It is a super-2 number, since 2×666036145² = 887208292892922050, which contains 22 as substring.

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, 66603610 + ... + 66603619.

It is an arithmetic number, because the mean of its divisors is an integer number (199810845).

Almost surely, 2^666036145 is an apocalyptic number.

It is an amenable number.

666036145 is a deficient number, since it is larger than the sum of its proper divisors (133207235).

666036145 is a wasteful number, since it uses less digits than its factorization.

666036145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133207234.

The product of its (nonzero) digits is 77760, while the sum is 37.

The square root of 666036145 is about 25807.6760867770. The cubic root of 666036145 is about 873.3049721607.

The spelling of 666036145 in words is "six hundred sixty-six million, thirty-six thousand, one hundred forty-five".