66707404647 has 16 divisors (see below), whose sum is σ = 95790309888. Its totient is φ = 41048431200.

The previous prime is 66707404637. The next prime is 66707404661. The reversal of 66707404647 is 74640470766.

66707404647 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 66707404647 - 2⁶ = 66707404583 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66707404647.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66707404637) 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, 906478 + ... + 977300.

It is an arithmetic number, because the mean of its divisors is an integer number (5986894368).

Almost surely, 2^66707404647 is an apocalyptic number.

66707404647 is a deficient number, since it is larger than the sum of its proper divisors (29082905241).

66707404647 is a wasteful number, since it uses less digits than its factorization.

66707404647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94990.

The product of its (nonzero) digits is 4741632, while the sum is 51.

The spelling of 66707404647 in words is "sixty-six billion, seven hundred seven million, four hundred four thousand, six hundred forty-seven".