66077155 has 16 divisors (see below), whose sum is σ = 84091680. Its totient is φ = 49704192.

The previous prime is 66077131. The next prime is 66077161. The reversal of 66077155 is 55177066.

66077155 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 66077155 - 2⁹ = 66076643 is a prime.

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 15 ways as a sum of consecutive naturals, for example, 10477 + ... + 15553.

It is an arithmetic number, because the mean of its divisors is an integer number (5255730).

Almost surely, 2^66077155 is an apocalyptic number.

66077155 is a deficient number, since it is larger than the sum of its proper divisors (18014525).

66077155 is a wasteful number, since it uses less digits than its factorization.

66077155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5238.

The product of its (nonzero) digits is 44100, while the sum is 37.

The square root of 66077155 is about 8128.7855796546. The cubic root of 66077155 is about 404.2814164321.

It can be divided in two parts, 660 and 77155, that added together give a triangular number (77815 = T₃₉₄).

The spelling of 66077155 in words is "sixty-six million, seventy-seven thousand, one hundred fifty-five".