66111616 has 32 divisors (see below), whose sum is σ = 132139980. Its totient is φ = 32947200.

The previous prime is 66111599. The next prime is 66111631. The reversal of 66111616 is 61611166.

It can be written as a sum of positive squares in 2 ways, for example, as 60840000 + 5271616 = 7800^2 + 2296^2 .

It is a tau number, because it is divible by the number of its divisors (32).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50166 + ... + 51466.

Almost surely, 2^66111616 is an apocalyptic number.

It is an amenable number.

66111616 is a deficient number, since it is larger than the sum of its proper divisors (66028364).

66111616 is a wasteful number, since it uses less digits than its factorization.

66111616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1712 (or 1700 counting only the distinct ones).

The product of its digits is 1296, while the sum is 28.

The square root of 66111616 is about 8130.9049926807. The cubic root of 66111616 is about 404.3516854009.

The spelling of 66111616 in words is "sixty-six million, one hundred eleven thousand, six hundred sixteen".