666651151 has 4 divisors (see below), whose sum is σ = 666750600. Its totient is φ = 666551704.

The previous prime is 666651121. The next prime is 666651169. The reversal of 666651151 is 151156666.

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 666651151 - 2⁷ = 666651023 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 666651151.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666651121) 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, 38881 + ... + 53338.

It is an arithmetic number, because the mean of its divisors is an integer number (166687650).

Almost surely, 2^666651151 is an apocalyptic number.

666651151 is a deficient number, since it is larger than the sum of its proper divisors (99449).

666651151 is an equidigital number, since it uses as much as digits as its factorization.

666651151 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99448.

The product of its digits is 32400, while the sum is 37.

The square root of 666651151 is about 25819.5885133749. The cubic root of 666651151 is about 873.5736875921.

The spelling of 666651151 in words is "six hundred sixty-six million, six hundred fifty-one thousand, one hundred fifty-one".