65065151661561 has 6 divisors (see below), whose sum is σ = 93982996844490. Its totient is φ = 43376767774368.

The previous prime is 65065151661481. The next prime is 65065151661613. The reversal of 65065151661561 is 16516615156056.

65065151661561 is a `hidden beast` number, since 6 + 5 + 0 + 6 + 5 + 1 + 5 + 16 + 61 + 561 = 666.

It can be written as a sum of positive squares in only one way, i.e., 40043837120400 + 25021314541161 = 6328020^2 + 5002131^2 .

It is not a de Polignac number, because 65065151661561 - 2²¹ = 65065149564409 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 65065151661498 and 65065151661507.

It is not an unprimeable number, because it can be changed into a prime (65065151661161) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3614730647856 + ... + 3614730647873.

It is an arithmetic number, because the mean of its divisors is an integer number (15663832807415).

Almost surely, 2^{65065151661561} is an apocalyptic number.

It is an amenable number.

65065151661561 is a deficient number, since it is larger than the sum of its proper divisors (28917845182929).

65065151661561 is a wasteful number, since it uses less digits than its factorization.

65065151661561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7229461295735 (or 7229461295732 counting only the distinct ones).

The product of its (nonzero) digits is 4860000, while the sum is 54.

The spelling of 65065151661561 in words is "sixty-five trillion, sixty-five billion, one hundred fifty-one million, six hundred sixty-one thousand, five hundred sixty-one".