65779990272 has 144 divisors (see below), whose sum is σ = 194703264000. Its totient is φ = 21906349056.

The previous prime is 65779990189. The next prime is 65779990273. The reversal of 65779990272 is 27209997756.

65779990272 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (144).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65779990273) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8698429 + ... + 8705987.

It is an arithmetic number, because the mean of its divisors is an integer number (1352106000).

Almost surely, 2^65779990272 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 65779990272, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (97351632000).

65779990272 is an abundant number, since it is smaller than the sum of its proper divisors (128923273728).

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

65779990272 is a wasteful number, since it uses less digits than its factorization.

65779990272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8843 (or 8823 counting only the distinct ones).

The product of its (nonzero) digits is 30005640, while the sum is 63.

The spelling of 65779990272 in words is "sixty-five billion, seven hundred seventy-nine million, nine hundred ninety thousand, two hundred seventy-two".