66801023 has 4 divisors (see below), whose sum is σ = 66836160. Its totient is φ = 66765888.

The previous prime is 66801019. The next prime is 66801029. The reversal of 66801023 is 32010866.

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

It is a cyclic number.

It is not a de Polignac number, because 66801023 - 2² = 66801019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66800983 and 66801001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66801029) 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, 14543 + ... + 18576.

It is an arithmetic number, because the mean of its divisors is an integer number (16709040).

Almost surely, 2^66801023 is an apocalyptic number.

66801023 is a deficient number, since it is larger than the sum of its proper divisors (35137).

66801023 is a wasteful number, since it uses less digits than its factorization.

66801023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35136.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 66801023 is about 8173.1892795897. The cubic root of 66801023 is about 405.7523443730.

Adding to 66801023 its reverse (32010866), we get a palindrome (98811889).

The spelling of 66801023 in words is "sixty-six million, eight hundred one thousand, twenty-three".