66061755 has 24 divisors (see below), whose sum is σ = 114835968. Its totient is φ = 35131776.

The previous prime is 66061747. The next prime is 66061757. The reversal of 66061755 is 55716066.

It is a happy number.

It is not a de Polignac number, because 66061755 - 2³ = 66061747 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66061757) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15319 + ... + 19151.

It is an arithmetic number, because the mean of its divisors is an integer number (4784832).

Almost surely, 2^66061755 is an apocalyptic number.

66061755 is a deficient number, since it is larger than the sum of its proper divisors (48774213).

66061755 is a wasteful number, since it uses less digits than its factorization.

66061755 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4227 (or 4224 counting only the distinct ones).

The product of its (nonzero) digits is 37800, while the sum is 36.

The square root of 66061755 is about 8127.8382734895. The cubic root of 66061755 is about 404.2500065973.

The spelling of 66061755 in words is "sixty-six million, sixty-one thousand, seven hundred fifty-five".