6660154140640 has 384 divisors, whose sum is σ = 21133115136000. Its totient is φ = 1915580620800.

The previous prime is 6660154140623. The next prime is 6660154140641. The reversal of 6660154140640 is 460414510666.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6660154140641) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 740094861 + ... + 740103859.

It is an arithmetic number, because the mean of its divisors is an integer number (55034154000).

Almost surely, 2^{6660154140640} 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 6660154140640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10566557568000).

6660154140640 is an abundant number, since it is smaller than the sum of its proper divisors (14472960995360).

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

6660154140640 is a wasteful number, since it uses less digits than its factorization.

6660154140640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13666 (or 13658 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 43.

The spelling of 6660154140640 in words is "six trillion, six hundred sixty billion, one hundred fifty-four million, one hundred forty thousand, six hundred forty".