66453865 has 8 divisors (see below), whose sum is σ = 80018568. Its totient is φ = 52980480.

The previous prime is 66453857. The next prime is 66453889. The reversal of 66453865 is 56835466.

66453865 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 3790809 + 62663056 = 1947^2 + 7916^2 .

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

It is not a de Polignac number, because 66453865 - 2³ = 66453857 is a prime.

It is a super-2 number, since 2×66453865² = 8832232346876450, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21216 + ... + 24145.

It is an arithmetic number, because the mean of its divisors is an integer number (10002321).

Almost surely, 2^66453865 is an apocalyptic number.

It is an amenable number.

66453865 is a deficient number, since it is larger than the sum of its proper divisors (13564703).

66453865 is a wasteful number, since it uses less digits than its factorization.

66453865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45659.

The product of its digits is 518400, while the sum is 43.

The square root of 66453865 is about 8151.9240060246. The cubic root of 66453865 is about 405.0482389323.

The spelling of 66453865 in words is "sixty-six million, four hundred fifty-three thousand, eight hundred sixty-five".