65838212258640 has 40 divisors (see below), whose sum is σ = 204098458002528. Its totient is φ = 17556856602240.

The previous prime is 65838212258627. The next prime is 65838212258671. The reversal of 65838212258640 is 4685221283856.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-3 number, since 3×65838212258640³ (a number of 42 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (60).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 137162941966 + ... + 137162942445.

Almost surely, 2^{65838212258640} is an apocalyptic number.

65838212258640 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

65838212258640 is an abundant number, since it is smaller than the sum of its proper divisors (138260245743888).

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

65838212258640 is a wasteful number, since it uses less digits than its factorization.

65838212258640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 274325884427 (or 274325884421 counting only the distinct ones).

The product of its (nonzero) digits is 44236800, while the sum is 60.

The spelling of 65838212258640 in words is "sixty-five trillion, eight hundred thirty-eight billion, two hundred twelve million, two hundred fifty-eight thousand, six hundred forty".