66645369 has 64 divisors (see below), whose sum is σ = 120985600. Its totient is φ = 35411904.

The previous prime is 66645347. The next prime is 66645413. The reversal of 66645369 is 96354666.

It is not a de Polignac number, because 66645369 - 2²³ = 58256761 is a prime.

It is a super-2 number, since 2×66645369² = 8883210418292322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66645169) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 240459 + ... + 240735.

It is an arithmetic number, because the mean of its divisors is an integer number (1890400).

Almost surely, 2^66645369 is an apocalyptic number.

It is an amenable number.

66645369 is a deficient number, since it is larger than the sum of its proper divisors (54340231).

66645369 is a wasteful number, since it uses less digits than its factorization.

66645369 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 379 (or 373 counting only the distinct ones).

The product of its digits is 699840, while the sum is 45.

The square root of 66645369 is about 8163.6614946971. The cubic root of 66645369 is about 405.4369495358.

The spelling of 66645369 in words is "sixty-six million, six hundred forty-five thousand, three hundred sixty-nine".