661010616065 has 16 divisors (see below), whose sum is σ = 801255986496. Its totient is φ = 523448808000.

The previous prime is 661010616053. The next prime is 661010616083. The reversal of 661010616065 is 560616010166.

It is a happy number.

661010616065 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 661010616065 - 2³⁰ = 659936874241 is a prime.

It is a Duffinian 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, 2010110 + ... + 2315720.

It is an arithmetic number, because the mean of its divisors is an integer number (50078499156).

Almost surely, 2^661010616065 is an apocalyptic number.

It is an amenable number.

661010616065 is a deficient number, since it is larger than the sum of its proper divisors (140245370431).

661010616065 is a wasteful number, since it uses less digits than its factorization.

661010616065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 310000.

The product of its (nonzero) digits is 38880, while the sum is 38.

The spelling of 661010616065 in words is "six hundred sixty-one billion, ten million, six hundred sixteen thousand, sixty-five".