666144635 has 8 divisors (see below), whose sum is σ = 860863920. Its totient is φ = 491922144.

The previous prime is 666144629. The next prime is 666144641. The reversal of 666144635 is 536441666.

It is an interprime number because it is at equal distance from previous prime (666144629) and next prime (666144641).

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 666144635 - 2¹² = 666140539 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 666144592 and 666144601.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 5124125 + ... + 5124254.

It is an arithmetic number, because the mean of its divisors is an integer number (107607990).

Almost surely, 2^666144635 is an apocalyptic number.

666144635 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

666144635 is a deficient number, since it is larger than the sum of its proper divisors (194719285).

666144635 is a wasteful number, since it uses less digits than its factorization.

666144635 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10248397.

The product of its digits is 311040, while the sum is 41.

The square root of 666144635 is about 25809.7778952086. Note that the first 3 decimals coincide. The cubic root of 666144635 is about 873.3523868610.

The spelling of 666144635 in words is "six hundred sixty-six million, one hundred forty-four thousand, six hundred thirty-five".