9665799812860 has 96 divisors (see below), whose sum is σ = 23234800760640. Its totient is φ = 3354196635648.

The previous prime is 9665799812807. The next prime is 9665799812869. The reversal of 9665799812860 is 682189975669.

It is a super-2 number, since 2×9665799812860² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (76).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9665799812869) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 19980627 + ... + 20458666.

It is an arithmetic number, because the mean of its divisors is an integer number (242029174590).

Almost surely, 2^{9665799812860} is an apocalyptic number.

It is an amenable number.

9665799812860 is an abundant number, since it is smaller than the sum of its proper divisors (13569000947780).

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

9665799812860 is a wasteful number, since it uses less digits than its factorization.

9665799812860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40439375 (or 40439373 counting only the distinct ones).

The product of its (nonzero) digits is 705438720, while the sum is 76.

The spelling of 9665799812860 in words is "nine trillion, six hundred sixty-five billion, seven hundred ninety-nine million, eight hundred twelve thousand, eight hundred sixty".