65801379840 has 448 divisors, whose sum is σ = 242407586304. Its totient is φ = 14929625088.

The previous prime is 65801379829. The next prime is 65801379863. The reversal of 65801379840 is 4897310856.

It is a tau number, because it is divible by the number of its divisors (448).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 195256152 + ... + 195256488.

Almost surely, 2^65801379840 is an apocalyptic number.

65801379840 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 65801379840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (121203793152).

65801379840 is an abundant number, since it is smaller than the sum of its proper divisors (176606206464).

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

65801379840 is a wasteful number, since it uses less digits than its factorization.

65801379840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 605 (or 581 counting only the distinct ones).

The product of its (nonzero) digits is 1451520, while the sum is 51.

The spelling of 65801379840 in words is "sixty-five billion, eight hundred one million, three hundred seventy-nine thousand, eight hundred forty".