66623101 has 4 divisors (see below), whose sum is σ = 70129600. Its totient is φ = 63116604.

The previous prime is 66623099. The next prime is 66623113. The reversal of 66623101 is 10132666.

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, and also an emirpimes, since its reverse is a distinct semiprime: 10132666 = 2 ⋅5066333.

It is a cyclic number.

It is not a de Polignac number, because 66623101 - 2¹ = 66623099 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 (66623131) 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 3 ways as a sum of consecutive naturals, for example, 1753221 + ... + 1753258.

It is an arithmetic number, because the mean of its divisors is an integer number (17532400).

Almost surely, 2^66623101 is an apocalyptic number.

It is an amenable number.

66623101 is a deficient number, since it is larger than the sum of its proper divisors (3506499).

66623101 is a wasteful number, since it uses less digits than its factorization.

66623101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3506498.

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 66623101 is about 8162.2975319453. The cubic root of 66623101 is about 405.3917887300.

Adding to 66623101 its reverse (10132666), we get a palindrome (76755767).

The spelling of 66623101 in words is "sixty-six million, six hundred twenty-three thousand, one hundred one".