65665726067560 has 128 divisors (see below), whose sum is σ = 162217804528800. Its totient is φ = 23812060446720.

The previous prime is 65665726067537. The next prime is 65665726067561. The reversal of 65665726067560 is 6576062756656.

It can be written as a sum of positive squares in 16 ways, for example, as 12956645017156 + 52709081050404 = 3599534^2 + 7260102^2 .

It is a hoax number, since the sum of its digits (67) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (65665726067561) 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, 4347364 + ... + 12256876.

Almost surely, 2^{65665726067560} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 65665726067560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (81108902264400).

65665726067560 is an abundant number, since it is smaller than the sum of its proper divisors (96552078461240).

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

65665726067560 is a wasteful number, since it uses less digits than its factorization.

65665726067560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7909991 (or 7909987 counting only the distinct ones).

The product of its (nonzero) digits is 571536000, while the sum is 67.

The spelling of 65665726067560 in words is "sixty-five trillion, six hundred sixty-five billion, seven hundred twenty-six million, sixty-seven thousand, five hundred sixty".