1216666101 has 16 divisors (see below), whose sum is σ = 1855361664. Its totient is φ = 694714944.

The previous prime is 1216666097. The next prime is 1216666109. The reversal of 1216666101 is 1016666121.

It is not a de Polignac number, because 1216666101 - 2² = 1216666097 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216666109) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7735 + ... + 49931.

It is an arithmetic number, because the mean of its divisors is an integer number (115960104).

Almost surely, 2^1216666101 is an apocalyptic number.

It is an amenable number.

1216666101 is a deficient number, since it is larger than the sum of its proper divisors (638695563).

1216666101 is a wasteful number, since it uses less digits than its factorization.

1216666101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43580.

The product of its (nonzero) digits is 2592, while the sum is 30.

The square root of 1216666101 is about 34880.7411188467. The cubic root of 1216666101 is about 1067.5555170062. Note that the first 4 decimals are identical.

The spelling of 1216666101 in words is "one billion, two hundred sixteen million, six hundred sixty-six thousand, one hundred one".