666163653 has 8 divisors (see below), whose sum is σ = 894180000. Its totient is φ = 441128208.

The previous prime is 666163633. The next prime is 666163657. The reversal of 666163653 is 356361666.

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

It is not a de Polignac number, because 666163653 - 2¹³ = 666155461 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666163657) 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 7 ways as a sum of consecutive naturals, for example, 744703 + ... + 745596.

It is an arithmetic number, because the mean of its divisors is an integer number (111772500).

Almost surely, 2^666163653 is an apocalyptic number.

It is an amenable number.

666163653 is a deficient number, since it is larger than the sum of its proper divisors (228016347).

666163653 is a wasteful number, since it uses less digits than its factorization.

666163653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1490451.

The product of its digits is 349920, while the sum is 42.

The square root of 666163653 is about 25810.1463188414. The cubic root of 666163653 is about 873.3606979978.

The spelling of 666163653 in words is "six hundred sixty-six million, one hundred sixty-three thousand, six hundred fifty-three".