1216862322660 has 72 divisors (see below), whose sum is σ = 3737872494720. Its totient is φ = 320389063488.

The previous prime is 1216862322649. The next prime is 1216862322691. The reversal of 1216862322660 is 662232686121.

1216862322660 is a `hidden beast` number, since 1 + 2 + 16 + 8 + 623 + 2 + 2 + 6 + 6 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 42772782 + ... + 42801221.

It is an arithmetic number, because the mean of its divisors is an integer number (51914895760).

Almost surely, 2^{1216862322660} is an apocalyptic number.

1216862322660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1216862322660 is an abundant number, since it is smaller than the sum of its proper divisors (2521010172060).

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

1216862322660 is a wasteful number, since it uses less digits than its factorization.

1216862322660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85574097 (or 85574092 counting only the distinct ones).

The product of its (nonzero) digits is 497664, while the sum is 45.

The spelling of 1216862322660 in words is "one trillion, two hundred sixteen billion, eight hundred sixty-two million, three hundred twenty-two thousand, six hundred sixty".