66501000121722 has 16 divisors (see below), whose sum is σ = 133015368741600. Its totient is φ = 22164771957552.

The previous prime is 66501000121691. The next prime is 66501000121817. The reversal of 66501000121722 is 22712100010566.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 556956088 + ... + 557075475.

It is an arithmetic number, because the mean of its divisors is an integer number (8313460546350).

Almost surely, 2^{66501000121722} is an apocalyptic number.

66501000121722 is an abundant number, since it is smaller than the sum of its proper divisors (66514368619878).

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

66501000121722 is a wasteful number, since it uses less digits than its factorization.

66501000121722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1114041517.

The product of its (nonzero) digits is 10080, while the sum is 33.

The spelling of 66501000121722 in words is "sixty-six trillion, five hundred one billion, one hundred twenty-one thousand, seven hundred twenty-two".