1171281666 has 16 divisors (see below), whose sum is σ = 2343729024. Its totient is φ = 390232944.

The previous prime is 1171281659. The next prime is 1171281677. The reversal of 1171281666 is 6661821711.

It is a super-2 number, since 2×1171281666² = 2743801482215471112, which contains 22 as substring.

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, 35226 + ... + 59861.

It is an arithmetic number, because the mean of its divisors is an integer number (146483064).

Almost surely, 2^1171281666 is an apocalyptic number.

1171281666 is an abundant number, since it is smaller than the sum of its proper divisors (1172447358).

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

1171281666 is a wasteful number, since it uses less digits than its factorization.

1171281666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97145.

The product of its digits is 24192, while the sum is 39.

The square root of 1171281666 is about 34223.9925490875. The cubic root of 1171281666 is about 1054.1128683348.

The spelling of 1171281666 in words is "one billion, one hundred seventy-one million, two hundred eighty-one thousand, six hundred sixty-six".