66723101 has 4 divisors (see below), whose sum is σ = 66789600. Its totient is φ = 66656604.

The previous prime is 66723077. The next prime is 66723109. The reversal of 66723101 is 10132766.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 66723101 - 2¹⁰ = 66722077 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 (66723109) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31721 + ... + 33758.

It is an arithmetic number, because the mean of its divisors is an integer number (16697400).

Almost surely, 2^66723101 is an apocalyptic number.

It is an amenable number.

66723101 is a deficient number, since it is larger than the sum of its proper divisors (66499).

66723101 is a wasteful number, since it uses less digits than its factorization.

66723101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66498.

The product of its (nonzero) digits is 1512, while the sum is 26.

The square root of 66723101 is about 8168.4209612385. The cubic root of 66723101 is about 405.5945157737.

Adding to 66723101 its reverse (10132766), we get a palindrome (76855867).

The spelling of 66723101 in words is "sixty-six million, seven hundred twenty-three thousand, one hundred one".