66165155 has 16 divisors (see below), whose sum is σ = 91680960. Its totient is φ = 44900352.

The previous prime is 66165149. The next prime is 66165217. The reversal of 66165155 is 55156166.

It is not a de Polignac number, because 66165155 - 2¹⁶ = 66099619 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6350 + ... + 13139.

It is an arithmetic number, because the mean of its divisors is an integer number (5730060).

Almost surely, 2^66165155 is an apocalyptic number.

66165155 is a deficient number, since it is larger than the sum of its proper divisors (25515805).

66165155 is a wasteful number, since it uses less digits than its factorization.

66165155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19598.

The product of its digits is 27000, while the sum is 35.

The square root of 66165155 is about 8134.1966413408. The cubic root of 66165155 is about 404.4608076447.

The spelling of 66165155 in words is "sixty-six million, one hundred sixty-five thousand, one hundred fifty-five".