66317445 has 24 divisors (see below), whose sum is σ = 116142936. Its totient is φ = 35002368.

The previous prime is 66317443. The next prime is 66317473. The reversal of 66317445 is 54471366.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 22638564 + 43678881 = 4758^2 + 6609^2 .

It is not a de Polignac number, because 66317445 - 2¹ = 66317443 is a prime.

It is a super-2 number, since 2×66317445² = 8796007022656050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66317443) 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, 3232 + ... + 11961.

It is an arithmetic number, because the mean of its divisors is an integer number (4839289).

Almost surely, 2^66317445 is an apocalyptic number.

It is an amenable number.

66317445 is a deficient number, since it is larger than the sum of its proper divisors (49825491).

66317445 is a wasteful number, since it uses less digits than its factorization.

66317445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15301 (or 15298 counting only the distinct ones).

The product of its digits is 60480, while the sum is 36.

The square root of 66317445 is about 8143.5523575403. The cubic root of 66317445 is about 404.7708809225.

The spelling of 66317445 in words is "sixty-six million, three hundred seventeen thousand, four hundred forty-five".