511101666 has 12 divisors (see below), whose sum is σ = 1107386982. Its totient is φ = 170367216.

The previous prime is 511101649. The next prime is 511101667. The reversal of 511101666 is 666101115.

It can be written as a sum of positive squares in only one way, i.e., 311699025 + 199402641 = 17655^2 + 14121^2 .

It is a super-2 number, since 2×511101666² = 522449825975951112, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (511101667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 14197251 + ... + 14197286.

Almost surely, 2^511101666 is an apocalyptic number.

511101666 is an abundant number, since it is smaller than the sum of its proper divisors (596285316).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

511101666 is a wasteful number, since it uses less digits than its factorization.

511101666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28394545 (or 28394542 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 27.

The square root of 511101666 is about 22607.5577186038. The cubic root of 511101666 is about 799.5318437990.

The spelling of 511101666 in words is "five hundred eleven million, one hundred one thousand, six hundred sixty-six".