66020101 has 24 divisors (see below), whose sum is σ = 79453440. Its totient is φ = 54667872.

The previous prime is 66020081. The next prime is 66020147. The reversal of 66020101 is 10102066.

It is not a de Polignac number, because 66020101 - 2⁷ = 66019973 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 (66020161) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 250896 + ... + 251158.

It is an arithmetic number, because the mean of its divisors is an integer number (3310560).

Almost surely, 2^66020101 is an apocalyptic number.

It is an amenable number.

66020101 is a deficient number, since it is larger than the sum of its proper divisors (13433339).

66020101 is a wasteful number, since it uses less digits than its factorization.

66020101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 433 (or 426 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 66020101 is about 8125.2754414850. The cubic root of 66020101 is about 404.1650246482.

Adding to 66020101 its reverse (10102066), we get a palindrome (76122167).

The spelling of 66020101 in words is "sixty-six million, twenty thousand, one hundred one".