66700573673621 has 16 divisors (see below), whose sum is σ = 69351013824000. Its totient is φ = 64073529273600.

The previous prime is 66700573673557. The next prime is 66700573673633. The reversal of 66700573673621 is 12637637500766.

It is a cyclic number.

It is not a de Polignac number, because 66700573673621 - 2⁶ = 66700573673557 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66700573673821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 111896756 + ... + 112491266.

It is an arithmetic number, because the mean of its divisors is an integer number (4334438364000).

Almost surely, 2^{66700573673621} is an apocalyptic number.

It is an amenable number.

66700573673621 is a deficient number, since it is larger than the sum of its proper divisors (2650440150379).

66700573673621 is a wasteful number, since it uses less digits than its factorization.

66700573673621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 614180.

The product of its (nonzero) digits is 40007520, while the sum is 59.

The spelling of 66700573673621 in words is "sixty-six trillion, seven hundred billion, five hundred seventy-three million, six hundred seventy-three thousand, six hundred twenty-one".