65810609901 has 12 divisors (see below), whose sum is σ = 95162106780. Its totient is φ = 43826507520.

The previous prime is 65810609881. The next prime is 65810609911. The reversal of 65810609901 is 10990601856.

65810609901 is a `hidden beast` number, since 6 + 581 + 0 + 60 + 9 + 9 + 0 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 24016940676 + 41793669225 = 154974^2 + 204435^2 .

It is not a de Polignac number, because 65810609901 - 2²⁹ = 65273738989 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65810609911) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3927210 + ... + 3943931.

It is an arithmetic number, because the mean of its divisors is an integer number (7930175565).

Almost surely, 2^65810609901 is an apocalyptic number.

It is an amenable number.

65810609901 is a deficient number, since it is larger than the sum of its proper divisors (29351496879).

65810609901 is a wasteful number, since it uses less digits than its factorization.

65810609901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7872076 (or 7872073 counting only the distinct ones).

The product of its (nonzero) digits is 116640, while the sum is 45.

The spelling of 65810609901 in words is "sixty-five billion, eight hundred ten million, six hundred nine thousand, nine hundred one".