66061567 has 16 divisors (see below), whose sum is σ = 77841792. Its totient is φ = 55271520.

The previous prime is 66061553. The next prime is 66061571. The reversal of 66061567 is 76516066.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 66061567 - 2¹⁹ = 65537279 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 (66061547) 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, 83548 + ... + 84334.

It is an arithmetic number, because the mean of its divisors is an integer number (4865112).

Almost surely, 2^66061567 is an apocalyptic number.

66061567 is a deficient number, since it is larger than the sum of its proper divisors (11780225).

66061567 is a wasteful number, since it uses less digits than its factorization.

66061567 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1398.

The product of its (nonzero) digits is 45360, while the sum is 37.

The square root of 66061567 is about 8127.8267082905. The cubic root of 66061567 is about 404.2496231224.

The spelling of 66061567 in words is "sixty-six million, sixty-one thousand, five hundred sixty-seven".