66010665 has 16 divisors (see below), whose sum is σ = 120705408. Its totient is φ = 30176256.

The previous prime is 66010657. The next prime is 66010669. The reversal of 66010665 is 56601066.

It is not a de Polignac number, because 66010665 - 2³ = 66010657 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66010669) 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 15 ways as a sum of consecutive naturals, for example, 314232 + ... + 314441.

It is an arithmetic number, because the mean of its divisors is an integer number (7544088).

Almost surely, 2^66010665 is an apocalyptic number.

It is an amenable number.

66010665 is a deficient number, since it is larger than the sum of its proper divisors (54694743).

66010665 is a wasteful number, since it uses less digits than its factorization.

66010665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 628688.

The product of its (nonzero) digits is 6480, while the sum is 30.

The square root of 66010665 is about 8124.6947634973. The cubic root of 66010665 is about 404.1457684781.

It can be divided in two parts, 660 and 10665, that added together give a triangular number (11325 = T₁₅₀).

The spelling of 66010665 in words is "sixty-six million, ten thousand, six hundred sixty-five".