66075407 has 4 divisors (see below), whose sum is σ = 69553080. Its totient is φ = 62597736.

The previous prime is 66075403. The next prime is 66075409. The reversal of 66075407 is 70457066.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 66075407 - 2² = 66075403 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66075403) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1738808 + ... + 1738845.

It is an arithmetic number, because the mean of its divisors is an integer number (17388270).

Almost surely, 2^66075407 is an apocalyptic number.

66075407 is a deficient number, since it is larger than the sum of its proper divisors (3477673).

66075407 is a wasteful number, since it uses less digits than its factorization.

66075407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3477672.

The product of its (nonzero) digits is 35280, while the sum is 35.

The square root of 66075407 is about 8128.6780598078. The cubic root of 66075407 is about 404.2778514574.

It can be divided in two parts, 660 and 75407, that added together give a palindrome (76067).

The spelling of 66075407 in words is "sixty-six million, seventy-five thousand, four hundred seven".