1216162780110 has 80 divisors (see below), whose sum is σ = 3382889637600. Its totient is φ = 313126962624.

The previous prime is 1216162780073. The next prime is 1216162780117. The reversal of 1216162780110 is 110872616121.

1216162780110 is a `hidden beast` number, since 1 + 2 + 1 + 616 + 27 + 8 + 0 + 1 + 10 = 666.

It is a super-2 number, since 2×1216162780110² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216162780117) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 25863330 + ... + 25910309.

It is an arithmetic number, because the mean of its divisors is an integer number (42286120470).

Almost surely, 2^{1216162780110} is an apocalyptic number.

1216162780110 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1216162780110 is an abundant number, since it is smaller than the sum of its proper divisors (2166726857490).

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

1216162780110 is a wasteful number, since it uses less digits than its factorization.

1216162780110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51773687 (or 51773678 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 36.

The spelling of 1216162780110 in words is "one trillion, two hundred sixteen billion, one hundred sixty-two million, seven hundred eighty thousand, one hundred ten".