66406412653 has 16 divisors (see below), whose sum is σ = 77205602304. Its totient is φ = 55943742960.

The previous prime is 66406412647. The next prime is 66406412689. The reversal of 66406412653 is 35621460466.

It is not a de Polignac number, because 66406412653 - 2⁹ = 66406412141 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 (66406412693) 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, 253933 + ... + 444178.

It is an arithmetic number, because the mean of its divisors is an integer number (4825350144).

Almost surely, 2^66406412653 is an apocalyptic number.

It is an amenable number.

66406412653 is a deficient number, since it is larger than the sum of its proper divisors (10799189651).

66406412653 is a wasteful number, since it uses less digits than its factorization.

66406412653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 698352.

The product of its (nonzero) digits is 622080, while the sum is 43.

The spelling of 66406412653 in words is "sixty-six billion, four hundred six million, four hundred twelve thousand, six hundred fifty-three".