66214765 has 12 divisors (see below), whose sum is σ = 80119836. Its totient is φ = 52533248.

The previous prime is 66214747. The next prime is 66214781. The reversal of 66214765 is 56741266.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 49519369 + 16695396 = 7037^2 + 4086^2 .

It is not a de Polignac number, because 66214765 - 2⁷ = 66214637 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 257517 + ... + 257773.

It is an arithmetic number, because the mean of its divisors is an integer number (6676653).

Almost surely, 2^66214765 is an apocalyptic number.

It is an amenable number.

66214765 is a deficient number, since it is larger than the sum of its proper divisors (13905071).

66214765 is an equidigital number, since it uses as much as digits as its factorization.

66214765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 716 (or 489 counting only the distinct ones).

The product of its digits is 60480, while the sum is 37.

The square root of 66214765 is about 8137.2455413365. The cubic root of 66214765 is about 404.5618693381.

The spelling of 66214765 in words is "sixty-six million, two hundred fourteen thousand, seven hundred sixty-five".