666059947 has 4 divisors (see below), whose sum is σ = 761211376. Its totient is φ = 570908520.

The previous prime is 666059899. The next prime is 666059969. The reversal of 666059947 is 749950666.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 749950666 = 2 ⋅374975333.

It is not a de Polignac number, because 666059947 - 2⁷ = 666059819 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 666059894 and 666059903.

It is not an unprimeable number, because it can be changed into a prime (666059987) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47575704 + ... + 47575717.

It is an arithmetic number, because the mean of its divisors is an integer number (190302844).

Almost surely, 2^666059947 is an apocalyptic number.

666059947 is a deficient number, since it is larger than the sum of its proper divisors (95151429).

666059947 is an equidigital number, since it uses as much as digits as its factorization.

666059947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95151428.

The product of its (nonzero) digits is 2449440, while the sum is 52.

The square root of 666059947 is about 25808.1372245267. The cubic root of 666059947 is about 873.3153750783.

The spelling of 666059947 in words is "six hundred sixty-six million, fifty-nine thousand, nine hundred forty-seven".