666117554 has 16 divisors (see below), whose sum is σ = 1013992992. Its totient is φ = 328130208.

The previous prime is 666117503. The next prime is 666117589. The reversal of 666117554 is 455711666.

666117554 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 167837 + ... + 171759.

It is an arithmetic number, because the mean of its divisors is an integer number (63374562).

Almost surely, 2^666117554 is an apocalyptic number.

666117554 is a deficient number, since it is larger than the sum of its proper divisors (347875438).

666117554 is a wasteful number, since it uses less digits than its factorization.

666117554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5161.

The product of its digits is 151200, while the sum is 41.

The square root of 666117554 is about 25809.2532631225. The cubic root of 666117554 is about 873.3405518054.

The spelling of 666117554 in words is "six hundred sixty-six million, one hundred seventeen thousand, five hundred fifty-four".