666106556 has 6 divisors (see below), whose sum is σ = 1165686480. Its totient is φ = 333053276.

The previous prime is 666106543. The next prime is 666106559. The reversal of 666106556 is 655601666.

It is a super-2 number, since 2×666106556² = 887395887892362272, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666106559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83263316 + ... + 83263323.

It is an arithmetic number, because the mean of its divisors is an integer number (194281080).

Almost surely, 2^666106556 is an apocalyptic number.

It is an amenable number.

666106556 is a deficient number, since it is larger than the sum of its proper divisors (499579924).

666106556 is a wasteful number, since it uses less digits than its factorization.

666106556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166526643 (or 166526641 counting only the distinct ones).

The product of its (nonzero) digits is 194400, while the sum is 41.

The square root of 666106556 is about 25809.0401991240. The cubic root of 666106556 is about 873.3357453203.

The spelling of 666106556 in words is "six hundred sixty-six million, one hundred six thousand, five hundred fifty-six".