1561650066506 has 16 divisors (see below), whose sum is σ = 2492857955016. Its totient is φ = 731163718656.

The previous prime is 1561650066463. The next prime is 1561650066511. The reversal of 1561650066506 is 6056600561651.

It can be written as a sum of positive squares in 4 ways, for example, as 1536090050881 + 25560015625 = 1239391^2 + 159875^2 .

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, 116569151 + ... + 116582546.

Almost surely, 2^{1561650066506} is an apocalyptic number.

1561650066506 is a deficient number, since it is larger than the sum of its proper divisors (931207888510).

1561650066506 is a wasteful number, since it uses less digits than its factorization.

1561650066506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 233151913.

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

The spelling of 1561650066506 in words is "one trillion, five hundred sixty-one billion, six hundred fifty million, sixty-six thousand, five hundred six".