66465375 has 24 divisors (see below), whose sum is σ = 110861712. Its totient is φ = 35364000.

The previous prime is 66465367. The next prime is 66465391. The reversal of 66465375 is 57356466.

It is not a de Polignac number, because 66465375 - 2³ = 66465367 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 157665 + ... + 158085.

It is an arithmetic number, because the mean of its divisors is an integer number (4619238).

Almost surely, 2^66465375 is an apocalyptic number.

66465375 is a deficient number, since it is larger than the sum of its proper divisors (44396337).

66465375 is an frugal number, since it uses more digits than its factorization.

66465375 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 860 (or 429 counting only the distinct ones).

The product of its digits is 453600, while the sum is 42.

The square root of 66465375 is about 8152.6299437666. The cubic root of 66465375 is about 405.0716227545.

It can be divided in two parts, 6646 and 5375, that added together give a palindrome (12021).

The spelling of 66465375 in words is "sixty-six million, four hundred sixty-five thousand, three hundred seventy-five".