666616113425177 has 4 divisors (see below), whose sum is σ = 666624784028880. Its totient is φ = 666607442821476.

The previous prime is 666616113425147. The next prime is 666616113425179. The reversal of 666616113425177 is 771524311616666.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 666616113425177 - 2²² = 666616109230873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (666616113425179) 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, 4335186527 + ... + 4335340292.

It is an arithmetic number, because the mean of its divisors is an integer number (166656196007220).

Almost surely, 2^{666616113425177} is an apocalyptic number.

It is an amenable number.

666616113425177 is a deficient number, since it is larger than the sum of its proper divisors (8670603703).

666616113425177 is an equidigital number, since it uses as much as digits as its factorization.

666616113425177 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8670603702.

The product of its digits is 45722880, while the sum is 62.

The spelling of 666616113425177 in words is "six hundred sixty-six trillion, six hundred sixteen billion, one hundred thirteen million, four hundred twenty-five thousand, one hundred seventy-seven".