66786265 has 36 divisors (see below), whose sum is σ = 101013804. Its totient is φ = 42247296.

The previous prime is 66786263. The next prime is 66786271. The reversal of 66786265 is 56268766.

It can be written as a sum of positive squares in 6 ways, for example, as 10055241 + 56731024 = 3171^2 + 7532^2 .

It is not a de Polignac number, because 66786265 - 2¹ = 66786263 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66786263) by changing a digit.

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 35 ways as a sum of consecutive naturals, for example, 40599 + ... + 42211.

It is an arithmetic number, because the mean of its divisors is an integer number (2805939).

Almost surely, 2^66786265 is an apocalyptic number.

66786265 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

66786265 is a deficient number, since it is larger than the sum of its proper divisors (34227539).

66786265 is a wasteful number, since it uses less digits than its factorization.

66786265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1658 (or 1638 counting only the distinct ones).

The product of its digits is 725760, while the sum is 46.

The square root of 66786265 is about 8172.2863997782. The cubic root of 66786265 is about 405.7224619258.

The spelling of 66786265 in words is "sixty-six million, seven hundred eighty-six thousand, two hundred sixty-five".