66512365 has 8 divisors (see below), whose sum is σ = 80521848. Its totient is φ = 52738560.

The previous prime is 66512323. The next prime is 66512393. The reversal of 66512365 is 56321566.

It can be written as a sum of positive squares in 4 ways, for example, as 24649 + 66487716 = 157^2 + 8154^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 66512365 - 2²¹ = 64415213 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66512365.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 58296 + ... + 59425.

It is an arithmetic number, because the mean of its divisors is an integer number (10065231).

Almost surely, 2^66512365 is an apocalyptic number.

It is an amenable number.

66512365 is a deficient number, since it is larger than the sum of its proper divisors (14009483).

66512365 is a wasteful number, since it uses less digits than its factorization.

66512365 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117839.

The product of its digits is 32400, while the sum is 34.

The square root of 66512365 is about 8155.5113267042. The cubic root of 66512365 is about 405.1670600738.

It can be divided in two parts, 6651236 and 5, that added together give a square (6651241 = 2579²).

The spelling of 66512365 in words is "sixty-six million, five hundred twelve thousand, three hundred sixty-five".