66722305 has 16 divisors (see below), whose sum is σ = 86446080. Its totient is φ = 49146048.

The previous prime is 66722303. The next prime is 66722309. The reversal of 66722305 is 50322766.

It is a cyclic number.

It is not a de Polignac number, because 66722305 - 2¹ = 66722303 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66722303) 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, 30064 + ... + 32206.

It is an arithmetic number, because the mean of its divisors is an integer number (5402880).

Almost surely, 2^66722305 is an apocalyptic number.

66722305 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

66722305 is a deficient number, since it is larger than the sum of its proper divisors (19723775).

66722305 is a wasteful number, since it uses less digits than its factorization.

66722305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2640.

The product of its (nonzero) digits is 15120, while the sum is 31.

The square root of 66722305 is about 8168.3722368658. The cubic root of 66722305 is about 405.5929028664.

The spelling of 66722305 in words is "sixty-six million, seven hundred twenty-two thousand, three hundred five".