66156105616 has 10 divisors (see below), whose sum is σ = 128177454662. Its totient is φ = 33078052800.

The previous prime is 66156105577. The next prime is 66156105629. The reversal of 66156105616 is 61650165166.

It can be written as a sum of positive squares in only one way, i.e., 61704547216 + 4451558400 = 248404^2 + 66720^2 .

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, 2067378285 + ... + 2067378316.

Almost surely, 2^66156105616 is an apocalyptic number.

It is an amenable number.

66156105616 is a deficient number, since it is larger than the sum of its proper divisors (62021349046).

66156105616 is a wasteful number, since it uses less digits than its factorization.

66156105616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4134756609 (or 4134756603 counting only the distinct ones).

The product of its (nonzero) digits is 194400, while the sum is 43.

The spelling of 66156105616 in words is "sixty-six billion, one hundred fifty-six million, one hundred five thousand, six hundred sixteen".