666070766 has 4 divisors (see below), whose sum is σ = 999106152. Its totient is φ = 333035382.

The previous prime is 666070721. The next prime is 666070771. The reversal of 666070766 is 667070666.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 667070666 = 2 ⋅333535333.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 166517690 + ... + 166517693.

It is an arithmetic number, because the mean of its divisors is an integer number (249776538).

Almost surely, 2^666070766 is an apocalyptic number.

666070766 is a deficient number, since it is larger than the sum of its proper divisors (333035386).

666070766 is a wasteful number, since it uses less digits than its factorization.

666070766 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333035385.

The product of its (nonzero) digits is 381024, while the sum is 44.

The square root of 666070766 is about 25808.3468281097. The cubic root of 666070766 is about 873.3201035555.

The spelling of 666070766 in words is "six hundred sixty-six million, seventy thousand, seven hundred sixty-six".