65977418240 has 80 divisors (see below), whose sum is σ = 158822959680. Its totient is φ = 26285568000.

The previous prime is 65977418239. The next prime is 65977418249. The reversal of 65977418240 is 4281477956.

It is a tau number, because it is divible by the number of its divisors (80).

It is not an unprimeable number, because it can be changed into a prime (65977418249) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 591221 + ... + 693899.

It is an arithmetic number, because the mean of its divisors is an integer number (1985286996).

Almost surely, 2^65977418240 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 65977418240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (79411479840).

65977418240 is an abundant number, since it is smaller than the sum of its proper divisors (92845541440).

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

65977418240 is a wasteful number, since it uses less digits than its factorization.

65977418240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102953 (or 102937 counting only the distinct ones).

The product of its (nonzero) digits is 3386880, while the sum is 53.

The spelling of 65977418240 in words is "sixty-five billion, nine hundred seventy-seven million, four hundred eighteen thousand, two hundred forty".