66077930646 has 96 divisors (see below), whose sum is σ = 179957127168. Its totient is φ = 17056336320.

The previous prime is 66077930603. The next prime is 66077930647. The reversal of 66077930646 is 64603977066.

66077930646 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 66077930592 and 66077930601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66077930647) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 352170 + ... + 506141.

It is an arithmetic number, because the mean of its divisors is an integer number (1874553408).

Almost surely, 2^66077930646 is an apocalyptic number.

66077930646 is an abundant number, since it is smaller than the sum of its proper divisors (113879196522).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66077930646 is a wasteful number, since it uses less digits than its factorization.

66077930646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 858386 (or 858383 counting only the distinct ones).

The product of its (nonzero) digits is 6858432, while the sum is 54.

The spelling of 66077930646 in words is "sixty-six billion, seventy-seven million, nine hundred thirty thousand, six hundred forty-six".