2166643364620 has 48 divisors (see below), whose sum is σ = 5200041627648. Its totient is φ = 742835217600.

The previous prime is 2166643364597. The next prime is 2166643364623. The reversal of 2166643364620 is 264633466612.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (2166643364623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9739149 + ... + 9959131.

It is an arithmetic number, because the mean of its divisors is an integer number (108334200576).

Almost surely, 2^{2166643364620} is an apocalyptic number.

2166643364620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2166643364620 is an abundant number, since it is smaller than the sum of its proper divisors (3033398263028).

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

2166643364620 is a wasteful number, since it uses less digits than its factorization.

2166643364620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 290350 (or 290348 counting only the distinct ones).

The product of its (nonzero) digits is 4478976, while the sum is 49.

The spelling of 2166643364620 in words is "two trillion, one hundred sixty-six billion, six hundred forty-three million, three hundred sixty-four thousand, six hundred twenty".