661354550110016 has 112 divisors (see below), whose sum is σ = 1538692631332992. Its totient is φ = 276185619302400.

The previous prime is 661354550110003. The next prime is 661354550110091. The reversal of 661354550110016 is 610011055453166.

It is a tau number, because it is divible by the number of its divisors (112).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 110162915 + ... + 116011106.

Almost surely, 2^{661354550110016} is an apocalyptic number.

It is an amenable number.

661354550110016 is an abundant number, since it is smaller than the sum of its proper divisors (877338081222976).

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

661354550110016 is a wasteful number, since it uses less digits than its factorization.

661354550110016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 226174208 (or 226174198 counting only the distinct ones).

The product of its (nonzero) digits is 324000, while the sum is 44.

The spelling of 661354550110016 in words is "six hundred sixty-one trillion, three hundred fifty-four billion, five hundred fifty million, one hundred ten thousand, sixteen".