66723607 has 6 divisors (see below), whose sum is σ = 67145568. Its totient is φ = 66302964.

The previous prime is 66723583. The next prime is 66723677. The reversal of 66723607 is 70632766.

It is a happy number.

It is not a de Polignac number, because 66723607 - 2¹⁹ = 66199319 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 (66723677) 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 5 ways as a sum of consecutive naturals, for example, 121708 + ... + 122254.

It is an arithmetic number, because the mean of its divisors is an integer number (11190928).

Almost surely, 2^66723607 is an apocalyptic number.

66723607 is a deficient number, since it is larger than the sum of its proper divisors (421961).

66723607 is an frugal number, since it uses more digits than its factorization.

66723607 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1317 (or 770 counting only the distinct ones).

The product of its (nonzero) digits is 63504, while the sum is 37.

The square root of 66723607 is about 8168.4519341182. The cubic root of 66723607 is about 405.5955410573.

The spelling of 66723607 in words is "sixty-six million, seven hundred twenty-three thousand, six hundred seven".