43106500666 has 4 divisors (see below), whose sum is σ = 64659751002. Its totient is φ = 21553250332.

The previous prime is 43106500639. The next prime is 43106500739. The reversal of 43106500666 is 66600560134.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 66600560134 = 2 ⋅33300280067.

It can be written as a sum of positive squares in only one way, i.e., 43106479641 + 21025 = 207621^2 + 145^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10776625165 + ... + 10776625168.

Almost surely, 2^43106500666 is an apocalyptic number.

43106500666 is a deficient number, since it is larger than the sum of its proper divisors (21553250336).

43106500666 is a wasteful number, since it uses less digits than its factorization.

43106500666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21553250335.

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

The spelling of 43106500666 in words is "forty-three billion, one hundred six million, five hundred thousand, six hundred sixty-six".