66061620363 has 16 divisors (see below), whose sum is σ = 91945764896. Its totient is φ = 42148304640.

The previous prime is 66061620343. The next prime is 66061620421. The reversal of 66061620363 is 36302616066.

It is a happy number.

It is not a de Polignac number, because 66061620363 - 2¹² = 66061616267 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66061620323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4871506 + ... + 4885047.

It is an arithmetic number, because the mean of its divisors is an integer number (5746610306).

Almost surely, 2^66061620363 is an apocalyptic number.

66061620363 is a deficient number, since it is larger than the sum of its proper divisors (25884144533).

66061620363 is a wasteful number, since it uses less digits than its factorization.

66061620363 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9756654.

The product of its (nonzero) digits is 139968, while the sum is 39.

The spelling of 66061620363 in words is "sixty-six billion, sixty-one million, six hundred twenty thousand, three hundred sixty-three".