666116511649 has 8 divisors (see below), whose sum is σ = 731661157440. Its totient is φ = 603620454096.

The previous prime is 666116511581. The next prime is 666116511659. The reversal of 666116511649 is 946115611666.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 666116511649 - 2⁷ = 666116511521 is a prime.

It is a super-2 number, since 2×666116511649² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 666116511596 and 666116511605.

It is not an unprimeable number, because it can be changed into a prime (666116511659) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 762146602 + ... + 762147475.

It is an arithmetic number, because the mean of its divisors is an integer number (91457644680).

Almost surely, 2^666116511649 is an apocalyptic number.

It is an amenable number.

666116511649 is a deficient number, since it is larger than the sum of its proper divisors (65544645791).

666116511649 is a wasteful number, since it uses less digits than its factorization.

666116511649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1524294119.

The product of its digits is 1399680, while the sum is 52.

The spelling of 666116511649 in words is "six hundred sixty-six billion, one hundred sixteen million, five hundred eleven thousand, six hundred forty-nine".