666506156 has 6 divisors (see below), whose sum is σ = 1166385780. Its totient is φ = 333253076.

The previous prime is 666506041. The next prime is 666506189. The reversal of 666506156 is 651605666.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83313266 + ... + 83313273.

It is an arithmetic number, because the mean of its divisors is an integer number (194397630).

Almost surely, 2^666506156 is an apocalyptic number.

It is an amenable number.

666506156 is a deficient number, since it is larger than the sum of its proper divisors (499879624).

666506156 is a wasteful number, since it uses less digits than its factorization.

666506156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166626543 (or 166626541 counting only the distinct ones).

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

The square root of 666506156 is about 25816.7805119074. The cubic root of 666506156 is about 873.5103496175.

The spelling of 666506156 in words is "six hundred sixty-six million, five hundred six thousand, one hundred fifty-six".