66868140964 has 6 divisors (see below), whose sum is σ = 117019246694. Its totient is φ = 33434070480.

The previous prime is 66868140959. The next prime is 66868141027. The reversal of 66868140964 is 46904186866.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 45334926400 + 21533214564 = 212920^2 + 146742^2 .

It is a junction number, because it is equal to n+sod(n) for n = 66868140899 and 66868140908.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8358517617 + ... + 8358517624.

Almost surely, 2^66868140964 is an apocalyptic number.

It is an amenable number.

66868140964 is a deficient number, since it is larger than the sum of its proper divisors (50151105730).

66868140964 is a wasteful number, since it uses less digits than its factorization.

66868140964 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16717035245 (or 16717035243 counting only the distinct ones).

The product of its (nonzero) digits is 11943936, while the sum is 58.

The spelling of 66868140964 in words is "sixty-six billion, eight hundred sixty-eight million, one hundred forty thousand, nine hundred sixty-four".