561506666666 has 16 divisors (see below), whose sum is σ = 919940159520. Its totient is φ = 254921672880.

The previous prime is 561506666627. The next prime is 561506666753. The reversal of 561506666666 is 666666605165.

561506666666 is a modest number, since divided by 666666 gives 561506 as remainder.

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 in 7 ways as a sum of consecutive naturals, for example, 15412901 + ... + 15449288.

It is an arithmetic number, because the mean of its divisors is an integer number (57496259970).

Almost surely, 2^561506666666 is an apocalyptic number.

561506666666 is a deficient number, since it is larger than the sum of its proper divisors (358433492854).

561506666666 is a wasteful number, since it uses less digits than its factorization.

561506666666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30863029.

The product of its (nonzero) digits is 41990400, while the sum is 59.

The spelling of 561506666666 in words is "five hundred sixty-one billion, five hundred six million, six hundred sixty-six thousand, six hundred sixty-six".