6661921825314 has 32 divisors (see below), whose sum is σ = 16919166541440. Its totient is φ = 1903406235696.

The previous prime is 6661921825277. The next prime is 6661921825379. The reversal of 6661921825314 is 4135281291666.

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

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, 8812065529 + ... + 8812066284.

It is an arithmetic number, because the mean of its divisors is an integer number (528723954420).

Almost surely, 2^{6661921825314} is an apocalyptic number.

6661921825314 is an abundant number, since it is smaller than the sum of its proper divisors (10257244716126).

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

6661921825314 is a wasteful number, since it uses less digits than its factorization.

6661921825314 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17624131831 (or 17624131825 counting only the distinct ones).

The product of its digits is 3732480, while the sum is 54.

The spelling of 6661921825314 in words is "six trillion, six hundred sixty-one billion, nine hundred twenty-one million, eight hundred twenty-five thousand, three hundred fourteen".