65681189409 has 32 divisors (see below), whose sum is σ = 101597984640. Its totient is φ = 37301529600.

The previous prime is 65681189407. The next prime is 65681189449. The reversal of 65681189409 is 90498118656.

It is not a de Polignac number, because 65681189409 - 2¹ = 65681189407 is a prime.

It is not an unprimeable number, because it can be changed into a prime (65681189407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 127162 + ... + 384099.

It is an arithmetic number, because the mean of its divisors is an integer number (3174937020).

Almost surely, 2^65681189409 is an apocalyptic number.

It is an amenable number.

65681189409 is a deficient number, since it is larger than the sum of its proper divisors (35916795231).

65681189409 is a wasteful number, since it uses less digits than its factorization.

65681189409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 511521.

The product of its (nonzero) digits is 3732480, while the sum is 57.

The spelling of 65681189409 in words is "sixty-five billion, six hundred eighty-one million, one hundred eighty-nine thousand, four hundred nine".