65812661409 has 16 divisors (see below), whose sum is σ = 96675309504. Its totient is φ = 39491544000.

The previous prime is 65812661401. The next prime is 65812661479. The reversal of 65812661409 is 90416621856.

65812661409 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 65812661409 - 2³ = 65812661401 is a prime.

It is not an unprimeable number, because it can be changed into a prime (65812661401) 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, 9869554 + ... + 9876219.

It is an arithmetic number, because the mean of its divisors is an integer number (6042206844).

Almost surely, 2^65812661409 is an apocalyptic number.

It is an amenable number.

65812661409 is a deficient number, since it is larger than the sum of its proper divisors (30862648095).

65812661409 is a wasteful number, since it uses less digits than its factorization.

65812661409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19745888.

The product of its (nonzero) digits is 622080, while the sum is 48.

The spelling of 65812661409 in words is "sixty-five billion, eight hundred twelve million, six hundred sixty-one thousand, four hundred nine".