66722051 has 8 divisors (see below), whose sum is σ = 73278000. Its totient is φ = 60247840.

The previous prime is 66722041. The next prime is 66722077. The reversal of 66722051 is 15022766.

66722051 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66722051 - 2¹⁸ = 66459907 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66722021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18716 + ... + 21993.

It is an arithmetic number, because the mean of its divisors is an integer number (9159750).

Almost surely, 2^66722051 is an apocalyptic number.

66722051 is a deficient number, since it is larger than the sum of its proper divisors (6555949).

66722051 is a wasteful number, since it uses less digits than its factorization.

66722051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40869.

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 66722051 is about 8168.3566890777. The cubic root of 66722051 is about 405.5923881923.

The spelling of 66722051 in words is "sixty-six million, seven hundred twenty-two thousand, fifty-one".