66111506 has 16 divisors (see below), whose sum is σ = 101126880. Its totient is φ = 32405760.

The previous prime is 66111497. The next prime is 66111523. The reversal of 66111506 is 60511166.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 67601 + ... + 68571.

It is an arithmetic number, because the mean of its divisors is an integer number (6320430).

Almost surely, 2^66111506 is an apocalyptic number.

66111506 is a deficient number, since it is larger than the sum of its proper divisors (35015374).

66111506 is a wasteful number, since it uses less digits than its factorization.

66111506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1609.

The product of its (nonzero) digits is 1080, while the sum is 26.

The square root of 66111506 is about 8130.8982283632. The cubic root of 66111506 is about 404.3514611402.

It can be divided in two parts, 661 and 11506, that added together give a cube (12167 = 23³).

The spelling of 66111506 in words is "sixty-six million, one hundred eleven thousand, five hundred six".