1668655032128 has 112 divisors (see below), whose sum is σ = 3794554003968. Its totient is φ = 713197056000.

The previous prime is 1668655032119. The next prime is 1668655032131. The reversal of 1668655032128 is 8212305568661.

It is a tau number, because it is divible by the number of its divisors (112).

It is a self number, because there is not a number n which added to its sum of digits gives 1668655032128.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 436704458 + ... + 436708278.

It is an arithmetic number, because the mean of its divisors is an integer number (33879946464).

Almost surely, 2^{1668655032128} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1668655032128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1897277001984).

1668655032128 is an abundant number, since it is smaller than the sum of its proper divisors (2125898971840).

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

1668655032128 is a wasteful number, since it uses less digits than its factorization.

1668655032128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6232 (or 6222 counting only the distinct ones).

The product of its (nonzero) digits is 4147200, while the sum is 53.

The spelling of 1668655032128 in words is "one trillion, six hundred sixty-eight billion, six hundred fifty-five million, thirty-two thousand, one hundred twenty-eight".