666516347 has 4 divisors (see below), whose sum is σ = 761732976. Its totient is φ = 571299720.

The previous prime is 666516343. The next prime is 666516359. The reversal of 666516347 is 743615666.

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

It is a cyclic number.

It is not a de Polignac number, because 666516347 - 2² = 666516343 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 666516298 and 666516307.

It is not an unprimeable number, because it can be changed into a prime (666516343) 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, 47608304 + ... + 47608317.

It is an arithmetic number, because the mean of its divisors is an integer number (190433244).

Almost surely, 2^666516347 is an apocalyptic number.

666516347 is a deficient number, since it is larger than the sum of its proper divisors (95216629).

666516347 is an equidigital number, since it uses as much as digits as its factorization.

666516347 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95216628.

The product of its digits is 544320, while the sum is 44.

The square root of 666516347 is about 25816.9778827809. The cubic root of 666516347 is about 873.5148016387.

The spelling of 666516347 in words is "six hundred sixty-six million, five hundred sixteen thousand, three hundred forty-seven".