666566101651 has 8 divisors (see below), whose sum is σ = 669480435360. Its totient is φ = 663657796992.

The previous prime is 666566101633. The next prime is 666566101783. The reversal of 666566101651 is 156101665666.

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

It is a cyclic number.

It is not a de Polignac number, because 666566101651 - 2⁹ = 666566101139 is a prime.

It is a super-2 number, since 2×666566101651² (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 = 666566101595 and 666566101604.

It is not an unprimeable number, because it can be changed into a prime (666566101631) 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, 1285591 + ... + 1727968.

It is an arithmetic number, because the mean of its divisors is an integer number (83685054420).

Almost surely, 2^666566101651 is an apocalyptic number.

666566101651 is a deficient number, since it is larger than the sum of its proper divisors (2914333709).

666566101651 is a wasteful number, since it uses less digits than its factorization.

666566101651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3014525.

The product of its (nonzero) digits is 1166400, while the sum is 49.

The spelling of 666566101651 in words is "six hundred sixty-six billion, five hundred sixty-six million, one hundred one thousand, six hundred fifty-one".