661006065016 has 16 divisors (see below), whose sum is σ = 1352057860440. Its totient is φ = 300457302240.

The previous prime is 661006065007. The next prime is 661006065029. The reversal of 661006065016 is 610560600166.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 3755716191 + ... + 3755716366.

Almost surely, 2^661006065016 is an apocalyptic number.

It is an amenable number.

661006065016 is an abundant number, since it is smaller than the sum of its proper divisors (691051795424).

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

661006065016 is a wasteful number, since it uses less digits than its factorization.

661006065016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7511432574 (or 7511432570 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 37.

The spelling of 661006065016 in words is "six hundred sixty-one billion, six million, sixty-five thousand, sixteen".