66111605 has 16 divisors (see below), whose sum is σ = 90941184. Its totient is φ = 45196800.

The previous prime is 66111599. The next prime is 66111631. The reversal of 66111605 is 50611166.

It is a de Polignac number, because none of the positive numbers 2^k-66111605 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

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, 9680 + ... + 15030.

It is an arithmetic number, because the mean of its divisors is an integer number (5683824).

Almost surely, 2^66111605 is an apocalyptic number.

It is an amenable number.

66111605 is a deficient number, since it is larger than the sum of its proper divisors (24829579).

66111605 is a wasteful number, since it uses less digits than its factorization.

66111605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5716.

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

The square root of 66111605 is about 8130.9043162492. The cubic root of 66111605 is about 404.3516629748.

The spelling of 66111605 in words is "sixty-six million, one hundred eleven thousand, six hundred five".