188531000666 has 8 divisors (see below), whose sum is σ = 283554669684. Its totient is φ = 94012777440.

The previous prime is 188531000657. The next prime is 188531000699. The reversal of 188531000666 is 666000135881.

It can be written as a sum of positive squares in 2 ways, for example, as 169245846025 + 19285154641 = 411395^2 + 138871^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 126360515 + ... + 126362006.

Almost surely, 2^188531000666 is an apocalyptic number.

188531000666 is the 232091-st centered heptagonal number.

188531000666 is a deficient number, since it is larger than the sum of its proper divisors (95023669018).

188531000666 is a wasteful number, since it uses less digits than its factorization.

188531000666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 252722896.

The product of its (nonzero) digits is 207360, while the sum is 44.

The spelling of 188531000666 in words is "one hundred eighty-eight billion, five hundred thirty-one million, six hundred sixty-six", and thus it is an aban number.