961938709566 has 16 divisors (see below), whose sum is σ = 1923916385664. Its totient is φ = 320639742104.

The previous prime is 961938709513. The next prime is 961938709573. The reversal of 961938709566 is 665907839169.

It is a self number, because there is not a number n which added to its sum of digits gives 961938709566.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1297650 + ... + 1899413.

It is an arithmetic number, because the mean of its divisors is an integer number (120244774104).

Almost surely, 2^961938709566 is an apocalyptic number.

961938709566 is an abundant number, since it is smaller than the sum of its proper divisors (961977676098).

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

961938709566 is a wasteful number, since it uses less digits than its factorization.

961938709566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3247215.

The product of its (nonzero) digits is 132269760, while the sum is 69.

The spelling of 961938709566 in words is "nine hundred sixty-one billion, nine hundred thirty-eight million, seven hundred nine thousand, five hundred sixty-six".