66061055 has 8 divisors (see below), whose sum is σ = 80769312. Its totient is φ = 51851488.

The previous prime is 66061049. The next prime is 66061057. The reversal of 66061055 is 55016066.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66061055 - 2¹⁰ = 66060031 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66061057) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 124379 + ... + 124908.

It is an arithmetic number, because the mean of its divisors is an integer number (10096164).

Almost surely, 2^66061055 is an apocalyptic number.

66061055 is a deficient number, since it is larger than the sum of its proper divisors (14708257).

66061055 is a wasteful number, since it uses less digits than its factorization.

66061055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 249345.

The product of its (nonzero) digits is 5400, while the sum is 29.

The square root of 66061055 is about 8127.7952114949. The cubic root of 66061055 is about 404.2485787616.

It can be divided in two parts, 660610 and 55, that multiplied together give a triangular number (36333550 = T₈₅₂₄).

The spelling of 66061055 in words is "sixty-six million, sixty-one thousand, fifty-five".