66061155 has 16 divisors (see below), whose sum is σ = 109108224. Its totient is φ = 34095840.

The previous prime is 66061153. The next prime is 66061183. The reversal of 66061155 is 55116066.

It is not a de Polignac number, because 66061155 - 2¹ = 66061153 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66061153) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 70569 + ... + 71498.

It is an arithmetic number, because the mean of its divisors is an integer number (6819264).

Almost surely, 2^66061155 is an apocalyptic number.

66061155 is a deficient number, since it is larger than the sum of its proper divisors (43047069).

66061155 is a wasteful number, since it uses less digits than its factorization.

66061155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142106.

The product of its (nonzero) digits is 5400, while the sum is 30.

The square root of 66061155 is about 8127.8013632224. The cubic root of 66061155 is about 404.2487827388.

The spelling of 66061155 in words is "sixty-six million, sixty-one thousand, one hundred fifty-five".