65401818209 has 64 divisors (see below), whose sum is σ = 87227062272. Its totient is φ = 47565619200.

The previous prime is 65401818191. The next prime is 65401818211. The reversal of 65401818209 is 90281810456.

It is not a de Polignac number, because 65401818209 - 2³² = 61106850913 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 65401818209.

It is not an unprimeable number, because it can be changed into a prime (65401818809) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 64056119 + ... + 64057139.

It is an arithmetic number, because the mean of its divisors is an integer number (1362922848).

Almost surely, 2^65401818209 is an apocalyptic number.

It is an amenable number.

65401818209 is a deficient number, since it is larger than the sum of its proper divisors (21825244063).

65401818209 is a wasteful number, since it uses less digits than its factorization.

65401818209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1986.

The product of its (nonzero) digits is 138240, while the sum is 44.

The spelling of 65401818209 in words is "sixty-five billion, four hundred one million, eight hundred eighteen thousand, two hundred nine".