666195482649 has 4 divisors (see below), whose sum is σ = 888260643536. Its totient is φ = 444130321764.

The previous prime is 666195482633. The next prime is 666195482651. The reversal of 666195482649 is 946284591666.

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 not a de Polignac number, because 666195482649 - 2⁴ = 666195482633 is a prime.

It is a super-2 number, since 2×666195482649² (a number of 24 digits) contains 22 as substring.

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 666195482649.

It is not an unprimeable number, because it can be changed into a prime (666195487649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 111032580439 + ... + 111032580444.

It is an arithmetic number, because the mean of its divisors is an integer number (222065160884).

Almost surely, 2^666195482649 is an apocalyptic number.

It is an amenable number.

666195482649 is a deficient number, since it is larger than the sum of its proper divisors (222065160887).

666195482649 is a wasteful number, since it uses less digits than its factorization.

666195482649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 222065160886.

The product of its digits is 134369280, while the sum is 66.

The spelling of 666195482649 in words is "six hundred sixty-six billion, one hundred ninety-five million, four hundred eighty-two thousand, six hundred forty-nine".