666072505 has 16 divisors (see below), whose sum is σ = 916602624. Its totient is φ = 455169600.

The previous prime is 666072503. The next prime is 666072587. The reversal of 666072505 is 505270666.

It is not a de Polignac number, because 666072505 - 2¹ = 666072503 is a prime.

It is not an unprimeable number, because it can be changed into a prime (666072503) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 22221 + ... + 42730.

It is an arithmetic number, because the mean of its divisors is an integer number (57287664).

Almost surely, 2^666072505 is an apocalyptic number.

It is an amenable number.

666072505 is a deficient number, since it is larger than the sum of its proper divisors (250530119).

666072505 is a wasteful number, since it uses less digits than its factorization.

666072505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65256.

The product of its (nonzero) digits is 75600, while the sum is 37.

The square root of 666072505 is about 25808.3805187385. The cubic root of 666072505 is about 873.3208635860.

The spelling of 666072505 in words is "six hundred sixty-six million, seventy-two thousand, five hundred five".