1216542146166 has 24 divisors (see below), whose sum is σ = 2635889228544. Its totient is φ = 405506677680.

The previous prime is 1216542146123. The next prime is 1216542146173. The reversal of 1216542146166 is 6616412456121.

1216542146166 is a `hidden beast` number, since 1 + 2 + 1 + 6 + 5 + 4 + 21 + 4 + 616 + 6 = 666.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 453696 + ... + 1624476.

It is an arithmetic number, because the mean of its divisors is an integer number (109828717856).

Almost surely, 2^{1216542146166} is an apocalyptic number.

1216542146166 is an abundant number, since it is smaller than the sum of its proper divisors (1419347082378).

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

1216542146166 is a wasteful number, since it uses less digits than its factorization.

1216542146166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1228516 (or 1228513 counting only the distinct ones).

The product of its digits is 414720, while the sum is 45.

The spelling of 1216542146166 in words is "one trillion, two hundred sixteen billion, five hundred forty-two million, one hundred forty-six thousand, one hundred sixty-six".