666605444415 has 32 divisors (see below), whose sum is σ = 1105227002880. Its totient is φ = 342678585984.

The previous prime is 666605444413. The next prime is 666605444429. The reversal of 666605444415 is 514444506666.

It is not a de Polignac number, because 666605444415 - 2¹ = 666605444413 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666605444413) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1049959 + ... + 1560648.

It is an arithmetic number, because the mean of its divisors is an integer number (34538343840).

Almost surely, 2^666605444415 is an apocalyptic number.

666605444415 is a deficient number, since it is larger than the sum of its proper divisors (438621558465).

666605444415 is a wasteful number, since it uses less digits than its factorization.

666605444415 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2611231.

The product of its (nonzero) digits is 8294400, while the sum is 51.

The spelling of 666605444415 in words is "six hundred sixty-six billion, six hundred five million, four hundred forty-four thousand, four hundred fifteen".