65408651538 has 16 divisors (see below), whose sum is σ = 131079468000. Its totient is φ = 21759189696.

The previous prime is 65408651537. The next prime is 65408651551. The reversal of 65408651538 is 83515680456.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (65408651537) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10920295 + ... + 10926282.

It is an arithmetic number, because the mean of its divisors is an integer number (8192466750).

Almost surely, 2^65408651538 is an apocalyptic number.

65408651538 is an abundant number, since it is smaller than the sum of its proper divisors (65670816462).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

65408651538 is a wasteful number, since it uses less digits than its factorization.

65408651538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21847081.

The product of its (nonzero) digits is 3456000, while the sum is 51.

The spelling of 65408651538 in words is "sixty-five billion, four hundred eight million, six hundred fifty-one thousand, five hundred thirty-eight".