66117354628 has 12 divisors (see below), whose sum is σ = 124605783820. Its totient is φ = 30515702112.

The previous prime is 66117354607. The next prime is 66117354659. The reversal of 66117354628 is 82645371166.

It can be written as a sum of positive squares in 2 ways, for example, as 8674687044 + 57442667584 = 93138^2 + 239672^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 635743743 + ... + 635743846.

Almost surely, 2^66117354628 is an apocalyptic number.

It is an amenable number.

66117354628 is a deficient number, since it is larger than the sum of its proper divisors (58488429192).

66117354628 is a wasteful number, since it uses less digits than its factorization.

66117354628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1271487606 (or 1271487604 counting only the distinct ones).

The product of its digits is 1451520, while the sum is 49.

The spelling of 66117354628 in words is "sixty-six billion, one hundred seventeen million, three hundred fifty-four thousand, six hundred twenty-eight".