11661658706646 has 48 divisors (see below), whose sum is σ = 27211845351600. Its totient is φ = 3588030146880.

The previous prime is 11661658706639. The next prime is 11661658706689. The reversal of 11661658706646 is 64660785616611.

11661658706646 is a `hidden beast` number, since 1 + 1 + 6 + 6 + 1 + 6 + 587 + 0 + 6 + 6 + 46 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3721905 + ... + 6097203.

It is an arithmetic number, because the mean of its divisors is an integer number (566913444825).

Almost surely, 2^{11661658706646} is an apocalyptic number.

11661658706646 is an abundant number, since it is smaller than the sum of its proper divisors (15550186644954).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11661658706646 is a wasteful number, since it uses less digits than its factorization.

11661658706646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2396301 (or 2396298 counting only the distinct ones).

The product of its (nonzero) digits is 52254720, while the sum is 63.

The spelling of 11661658706646 in words is "eleven trillion, six hundred sixty-one billion, six hundred fifty-eight million, seven hundred six thousand, six hundred forty-six".