6661560661012 has 6 divisors (see below), whose sum is σ = 11657731156778. Its totient is φ = 3330780330504.

The previous prime is 6661560661003. The next prime is 6661560661031. The reversal of 6661560661012 is 2101660651666.

It can be written as a sum of positive squares in only one way, i.e., 5917902790276 + 743657870736 = 2432674^2 + 862356^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 832695082623 + ... + 832695082630.

Almost surely, 2^{6661560661012} is an apocalyptic number.

It is an amenable number.

6661560661012 is a deficient number, since it is larger than the sum of its proper divisors (4996170495766).

6661560661012 is a wasteful number, since it uses less digits than its factorization.

6661560661012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1665390165257 (or 1665390165255 counting only the distinct ones).

The product of its (nonzero) digits is 466560, while the sum is 46.

The spelling of 6661560661012 in words is "six trillion, six hundred sixty-one billion, five hundred sixty million, six hundred sixty-one thousand, twelve".