6668888153540 has 24 divisors (see below), whose sum is σ = 14006149221120. Its totient is φ = 2667272575968.

The previous prime is 6668888153537. The next prime is 6668888153549. The reversal of 6668888153540 is 453518888666.

It is a happy number.

It is a super-2 number, since 2×6668888153540² (a number of 26 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (6668888153549) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17474342 + ... + 17851901.

It is an arithmetic number, because the mean of its divisors is an integer number (583589550880).

Almost surely, 2^{6668888153540} is an apocalyptic number.

It is an amenable number.

6668888153540 is an abundant number, since it is smaller than the sum of its proper divisors (7337261067580).

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

6668888153540 is a wasteful number, since it uses less digits than its factorization.

6668888153540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35335691 (or 35335689 counting only the distinct ones).

The product of its (nonzero) digits is 265420800, while the sum is 68.

The spelling of 6668888153540 in words is "six trillion, six hundred sixty-eight billion, eight hundred eighty-eight million, one hundred fifty-three thousand, five hundred forty".