66145933 has 6 divisors (see below), whose sum is σ = 76945326. Its totient is φ = 56696472.

The previous prime is 66145841. The next prime is 66145939. The reversal of 66145933 is 33954166.

It can be written as a sum of positive squares in only one way, i.e., 62678889 + 3467044 = 7917^2 + 1862^2 .

It is a de Polignac number, because none of the positive numbers 2^k-66145933 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66145892 and 66145901.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66145939) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 674910 + ... + 675007.

It is an arithmetic number, because the mean of its divisors is an integer number (12824221).

Almost surely, 2^66145933 is an apocalyptic number.

It is an amenable number.

66145933 is a deficient number, since it is larger than the sum of its proper divisors (10799393).

66145933 is a wasteful number, since it uses less digits than its factorization.

66145933 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1349931 (or 1349924 counting only the distinct ones).

The product of its digits is 58320, while the sum is 37.

The square root of 66145933 is about 8133.0150006009. The cubic root of 66145933 is about 404.4216364795.

The spelling of 66145933 in words is "sixty-six million, one hundred forty-five thousand, nine hundred thirty-three".