65809936507444 has 48 divisors (see below), whose sum is σ = 127432647353088. Its totient is φ = 29605564412928.

The previous prime is 65809936507433. The next prime is 65809936507451. The reversal of 65809936507444 is 44470563990856.

It is a super-2 number, since 2×65809936507444² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 239296809 + ... + 239571664.

It is an arithmetic number, because the mean of its divisors is an integer number (2654846819856).

Almost surely, 2^{65809936507444} is an apocalyptic number.

It is an amenable number.

65809936507444 is a deficient number, since it is larger than the sum of its proper divisors (61622710845644).

65809936507444 is a wasteful number, since it uses less digits than its factorization.

65809936507444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 478868584 (or 478868582 counting only the distinct ones).

The product of its (nonzero) digits is 783820800, while the sum is 70.

The spelling of 65809936507444 in words is "sixty-five trillion, eight hundred nine billion, nine hundred thirty-six million, five hundred seven thousand, four hundred forty-four".