66648101 has 4 divisors (see below), whose sum is σ = 71774892. Its totient is φ = 61521312.

The previous prime is 66648097. The next prime is 66648133. The reversal of 66648101 is 10184666.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 14822500 + 51825601 = 3850^2 + 7199^2 .

It is a cyclic number.

It is not a de Polignac number, because 66648101 - 2² = 66648097 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66648161) 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, 2563376 + ... + 2563401.

It is an arithmetic number, because the mean of its divisors is an integer number (17943723).

Almost surely, 2^66648101 is an apocalyptic number.

It is an amenable number.

66648101 is a deficient number, since it is larger than the sum of its proper divisors (5126791).

66648101 is a wasteful number, since it uses less digits than its factorization.

66648101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5126790.

The product of its (nonzero) digits is 6912, while the sum is 32.

The square root of 66648101 is about 8163.8288198614. The cubic root of 66648101 is about 405.4424894987.

The spelling of 66648101 in words is "sixty-six million, six hundred forty-eight thousand, one hundred one".