66015645 has 8 divisors (see below), whose sum is σ = 105625056. Its totient is φ = 35208336.

The previous prime is 66015637. The next prime is 66015667. The reversal of 66015645 is 54651066.

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

It is not a de Polignac number, because 66015645 - 2³ = 66015637 is a prime.

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 7 ways as a sum of consecutive naturals, for example, 2200507 + ... + 2200536.

It is an arithmetic number, because the mean of its divisors is an integer number (13203132).

Almost surely, 2^66015645 is an apocalyptic number.

It is an amenable number.

66015645 is a deficient number, since it is larger than the sum of its proper divisors (39609411).

66015645 is a wasteful number, since it uses less digits than its factorization.

66015645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4401051.

The product of its (nonzero) digits is 21600, while the sum is 33.

The square root of 66015645 is about 8125.0012307691. The cubic root of 66015645 is about 404.1559314587.

It can be divided in two parts, 6601 and 5645, that added together give a triangular number (12246 = T₁₅₆).

The spelling of 66015645 in words is "sixty-six million, fifteen thousand, six hundred forty-five".