66854770064 has 40 divisors (see below), whose sum is σ = 133531170720. Its totient is φ = 32410637568.

The previous prime is 66854770051. The next prime is 66854770069. The reversal of 66854770064 is 46007745866.

66854770064 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 = 66854769988 and 66854770015.

It is not an unprimeable number, because it can be changed into a prime (66854770069) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 416162 + ... + 553985.

It is an arithmetic number, because the mean of its divisors is an integer number (3338279268).

Almost surely, 2^66854770064 is an apocalyptic number.

It is an amenable number.

66854770064 is a deficient number, since it is larger than the sum of its proper divisors (66676400656).

66854770064 is a wasteful number, since it uses less digits than its factorization.

66854770064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 970287 (or 970281 counting only the distinct ones).

The product of its (nonzero) digits is 6773760, while the sum is 53.

The spelling of 66854770064 in words is "sixty-six billion, eight hundred fifty-four million, seven hundred seventy thousand, sixty-four".