1668333151656 has 80 divisors (see below), whose sum is σ = 4674212617140. Its totient is φ = 555952170240.

The previous prime is 1668333151603. The next prime is 1668333151657. The reversal of 1668333151656 is 6561513338661.

1668333151656 is a `hidden beast` number, since 1 + 6 + 68 + 33 + 31 + 516 + 5 + 6 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1662165562500 + 6167589156 = 1289250^2 + 78534^2 .

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (1668333151657) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1912996 + ... + 2645036.

Almost surely, 2^{1668333151656} is an apocalyptic number.

It is an amenable number.

1668333151656 is an abundant number, since it is smaller than the sum of its proper divisors (3005879465484).

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

1668333151656 is a wasteful number, since it uses less digits than its factorization.

1668333151656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 735576 (or 735563 counting only the distinct ones).

The product of its digits is 6998400, while the sum is 54.

The spelling of 1668333151656 in words is "one trillion, six hundred sixty-eight billion, three hundred thirty-three million, one hundred fifty-one thousand, six hundred fifty-six".