1666122898560 has 128 divisors (see below), whose sum is σ = 5312186487360. Its totient is φ = 444180664320.

The previous prime is 1666122898439. The next prime is 1666122898591. The reversal of 1666122898560 is 658982216661.

It is a tau number, because it is divible by the number of its divisors (128).

It is a Harshad number since it is a multiple of its sum of digits (60).

It is a junction number, because it is equal to n+sod(n) for n = 1666122898494 and 1666122898503.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7187670 + ... + 7415850.

Almost surely, 2^{1666122898560} is an apocalyptic number.

1666122898560 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1666122898560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2656093243680).

1666122898560 is an abundant number, since it is smaller than the sum of its proper divisors (3646063588800).

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

1666122898560 is a wasteful number, since it uses less digits than its factorization.

1666122898560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 232006 (or 231994 counting only the distinct ones).

The product of its (nonzero) digits is 14929920, while the sum is 60.

The spelling of 1666122898560 in words is "one trillion, six hundred sixty-six billion, one hundred twenty-two million, eight hundred ninety-eight thousand, five hundred sixty".