65500021200561 has 16 divisors (see below), whose sum is σ = 90348961022400. Its totient is φ = 42159017896128.

The previous prime is 65500021200553. The next prime is 65500021200611. The reversal of 65500021200561 is 16500212000556.

It is not a de Polignac number, because 65500021200561 - 2³ = 65500021200553 is a prime.

It is not an unprimeable number, because it can be changed into a prime (65500021200461) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15173446 + ... + 19006143.

It is an arithmetic number, because the mean of its divisors is an integer number (5646810063900).

Almost surely, 2^{65500021200561} is an apocalyptic number.

It is an amenable number.

65500021200561 is a deficient number, since it is larger than the sum of its proper divisors (24848939821839).

65500021200561 is a wasteful number, since it uses less digits than its factorization.

65500021200561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34201648.

The product of its (nonzero) digits is 18000, while the sum is 33.

The spelling of 65500021200561 in words is "sixty-five trillion, five hundred billion, twenty-one million, two hundred thousand, five hundred sixty-one".