66306421365 has 16 divisors (see below), whose sum is σ = 106682961600. Its totient is φ = 35165862272.

The previous prime is 66306421361. The next prime is 66306421373. The reversal of 66306421365 is 56312460366.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 66306421365 - 2² = 66306421361 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66306421361) 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, 12344880 + ... + 12350249.

It is an arithmetic number, because the mean of its divisors is an integer number (6667685100).

Almost surely, 2^66306421365 is an apocalyptic number.

It is an amenable number.

66306421365 is a deficient number, since it is larger than the sum of its proper divisors (40376540235).

66306421365 is a wasteful number, since it uses less digits than its factorization.

66306421365 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24695316.

The product of its (nonzero) digits is 466560, while the sum is 42.

The spelling of 66306421365 in words is "sixty-six billion, three hundred six million, four hundred twenty-one thousand, three hundred sixty-five".