65139982333440 has 1920 divisors, whose sum is σ = 258680060559360. Its totient is φ = 13918093443072.

The previous prime is 65139982333357. The next prime is 65139982333453. The reversal of 65139982333440 is 4433328993156.

It is a tau number, because it is divible by the number of its divisors (1920).

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 191 ways as a sum of consecutive naturals, for example, 59597421534 + ... + 59597422626.

It is an arithmetic number, because the mean of its divisors is an integer number (134729198208).

Almost surely, 2^{65139982333440} is an apocalyptic number.

65139982333440 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 65139982333440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (129340030279680).

65139982333440 is an abundant number, since it is smaller than the sum of its proper divisors (193540078225920).

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

65139982333440 is a wasteful number, since it uses less digits than its factorization.

65139982333440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1332 (or 1309 counting only the distinct ones).

The product of its (nonzero) digits is 50388480, while the sum is 60.

The spelling of 65139982333440 in words is "sixty-five trillion, one hundred thirty-nine billion, nine hundred eighty-two million, three hundred thirty-three thousand, four hundred forty".