66616939628 has 6 divisors (see below), whose sum is σ = 116579644356. Its totient is φ = 33308469812.

The previous prime is 66616939553. The next prime is 66616939637. The reversal of 66616939628 is 82693961666.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8327117450 + ... + 8327117457.

It is an arithmetic number, because the mean of its divisors is an integer number (19429940726).

Almost surely, 2^66616939628 is an apocalyptic number.

It is an amenable number.

66616939628 is a deficient number, since it is larger than the sum of its proper divisors (49962704728).

66616939628 is a wasteful number, since it uses less digits than its factorization.

66616939628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16654234911 (or 16654234909 counting only the distinct ones).

The product of its digits is 30233088, while the sum is 62.

The spelling of 66616939628 in words is "sixty-six billion, six hundred sixteen million, nine hundred thirty-nine thousand, six hundred twenty-eight".