66440575 has 12 divisors (see below), whose sum is σ = 82847128. Its totient is φ = 52855200.

The previous prime is 66440551. The next prime is 66440597. The reversal of 66440575 is 57504466.

It is a happy number.

66440575 is nontrivially palindromic in base 4.

It is not a de Polignac number, because 66440575 - 2⁷ = 66440447 is a prime.

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2817 + ... + 11866.

Almost surely, 2^66440575 is an apocalyptic number.

66440575 is a deficient number, since it is larger than the sum of its proper divisors (16406553).

66440575 is a wasteful number, since it uses less digits than its factorization.

66440575 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14874 (or 14869 counting only the distinct ones).

The product of its (nonzero) digits is 100800, while the sum is 37.

The square root of 66440575 is about 8151.1088202772. The cubic root of 66440575 is about 405.0212354866.

The spelling of 66440575 in words is "sixty-six million, four hundred forty thousand, five hundred seventy-five".