66722221941 has 16 divisors (see below), whose sum is σ = 89221488960. Its totient is φ = 44352282240.

The previous prime is 66722221919. The next prime is 66722221949. The reversal of 66722221941 is 14912222766.

It is a happy number.

It is not a de Polignac number, because 66722221941 - 2⁹ = 66722221429 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66722221893 and 66722221902.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66722221949) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7068561 + ... + 7077993.

It is an arithmetic number, because the mean of its divisors is an integer number (5576343060).

Almost surely, 2^66722221941 is an apocalyptic number.

It is an amenable number.

66722221941 is a deficient number, since it is larger than the sum of its proper divisors (22499267019).

66722221941 is a wasteful number, since it uses less digits than its factorization.

66722221941 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16036.

The product of its digits is 145152, while the sum is 42.

The spelling of 66722221941 in words is "sixty-six billion, seven hundred twenty-two million, two hundred twenty-one thousand, nine hundred forty-one".