1216650123 has 24 divisors (see below), whose sum is σ = 1992179280. Its totient is φ = 709300800.

The previous prime is 1216650091. The next prime is 1216650167. The reversal of 1216650123 is 3210566121.

1216650123 is a `hidden beast` number, since 1 + 2 + 1 + 6 + 650 + 1 + 2 + 3 = 666.

It is not a de Polignac number, because 1216650123 - 2⁵ = 1216650091 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1216650023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 271428 + ... + 275873.

It is an arithmetic number, because the mean of its divisors is an integer number (83007470).

Almost surely, 2^1216650123 is an apocalyptic number.

1216650123 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1216650123 is a deficient number, since it is larger than the sum of its proper divisors (775529157).

1216650123 is a wasteful number, since it uses less digits than its factorization.

1216650123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 547339 (or 547336 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 1216650123 is about 34880.5120805300. The cubic root of 1216650123 is about 1067.5508437228.

The spelling of 1216650123 in words is "one billion, two hundred sixteen million, six hundred fifty thousand, one hundred twenty-three".