666554107 has 4 divisors (see below), whose sum is σ = 670643560. Its totient is φ = 662464656.

The previous prime is 666554101. The next prime is 666554111. The reversal of 666554107 is 701455666.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 666554107 - 2¹¹ = 666552059 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 666554107.

It is not an unprimeable number, because it can be changed into a prime (666554101) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2044482 + ... + 2044807.

It is an arithmetic number, because the mean of its divisors is an integer number (167660890).

Almost surely, 2^666554107 is an apocalyptic number.

666554107 is a deficient number, since it is larger than the sum of its proper divisors (4089453).

666554107 is a wasteful number, since it uses less digits than its factorization.

666554107 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4089452.

The product of its (nonzero) digits is 151200, while the sum is 40.

The square root of 666554107 is about 25817.7091741308. The cubic root of 666554107 is about 873.5312970061.

The spelling of 666554107 in words is "six hundred sixty-six million, five hundred fifty-four thousand, one hundred seven".