1214156666 has 4 divisors (see below), whose sum is σ = 1821235002. Its totient is φ = 607078332.

The previous prime is 1214156651. The next prime is 1214156707. The reversal of 1214156666 is 6666514121.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1081423225 + 132733441 = 32885^2 + 11521^2 .

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 303539165 + ... + 303539168.

Almost surely, 2^1214156666 is an apocalyptic number.

1214156666 is a deficient number, since it is larger than the sum of its proper divisors (607078336).

1214156666 is an equidigital number, since it uses as much as digits as its factorization.

1214156666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 607078335.

The product of its digits is 51840, while the sum is 38.

The square root of 1214156666 is about 34844.7509102878. The cubic root of 1214156666 is about 1066.8210495078.

The spelling of 1214156666 in words is "one billion, two hundred fourteen million, one hundred fifty-six thousand, six hundred sixty-six".