66561565106 has 16 divisors (see below), whose sum is σ = 101180495520. Its totient is φ = 32836335840.

The previous prime is 66561565099. The next prime is 66561565121. The reversal of 66561565106 is 60156516566.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 317240 + ... + 483491.

It is an arithmetic number, because the mean of its divisors is an integer number (6323780970).

Almost surely, 2^66561565106 is an apocalyptic number.

66561565106 is a deficient number, since it is larger than the sum of its proper divisors (34618930414).

66561565106 is a wasteful number, since it uses less digits than its factorization.

66561565106 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 801289.

The product of its (nonzero) digits is 972000, while the sum is 47.

The spelling of 66561565106 in words is "sixty-six billion, five hundred sixty-one million, five hundred sixty-five thousand, one hundred six".