666251117 has 4 divisors (see below), whose sum is σ = 761429856. Its totient is φ = 571072380.

The previous prime is 666251083. The next prime is 666251177. The reversal of 666251117 is 711152666.

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 666251117 - 2¹⁰ = 666250093 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666251177) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47589359 + ... + 47589372.

It is an arithmetic number, because the mean of its divisors is an integer number (190357464).

Almost surely, 2^666251117 is an apocalyptic number.

It is an amenable number.

666251117 is a deficient number, since it is larger than the sum of its proper divisors (95178739).

666251117 is an equidigital number, since it uses as much as digits as its factorization.

666251117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95178738.

The product of its digits is 15120, while the sum is 35.

The square root of 666251117 is about 25811.8406356463. The cubic root of 666251117 is about 873.3989189750.

The spelling of 666251117 in words is "six hundred sixty-six million, two hundred fifty-one thousand, one hundred seventeen".