66721157005702 has 16 divisors (see below), whose sum is σ = 102523362987024. Its totient is φ = 32546712352000.

The previous prime is 66721157005691. The next prime is 66721157005703. The reversal of 66721157005702 is 20750075112766.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66721157005703) 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, 11976702 + ... + 16639822.

It is an arithmetic number, because the mean of its divisors is an integer number (6407710186689).

Almost surely, 2^{66721157005702} is an apocalyptic number.

66721157005702 is a deficient number, since it is larger than the sum of its proper divisors (35802205981322).

66721157005702 is a wasteful number, since it uses less digits than its factorization.

66721157005702 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4837655.

The product of its (nonzero) digits is 1234800, while the sum is 49.

The spelling of 66721157005702 in words is "sixty-six trillion, seven hundred twenty-one billion, one hundred fifty-seven million, five thousand, seven hundred two".