666163505 has 32 divisors (see below), whose sum is σ = 928005120. Its totient is φ = 449648640.

The previous prime is 666163499. The next prime is 666163517. The reversal of 666163505 is 505361666.

It is not a de Polignac number, because 666163505 - 2¹² = 666159409 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 810995 + ... + 811815.

It is an arithmetic number, because the mean of its divisors is an integer number (29000160).

Almost surely, 2^666163505 is an apocalyptic number.

It is an amenable number.

666163505 is a deficient number, since it is larger than the sum of its proper divisors (261841615).

666163505 is a wasteful number, since it uses less digits than its factorization.

666163505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1169.

The product of its (nonzero) digits is 97200, while the sum is 38.

The square root of 666163505 is about 25810.1434517517. The cubic root of 666163505 is about 873.3606333203.

The spelling of 666163505 in words is "six hundred sixty-six million, one hundred sixty-three thousand, five hundred five".