65787320261 has 8 divisors (see below), whose sum is σ = 70881924960. Its totient is φ = 60697578672.

The previous prime is 65787320257. The next prime is 65787320303. The reversal of 65787320261 is 16202378756.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 65787320261 - 2² = 65787320257 is a prime.

It is a super-3 number, since 3×65787320261³ (a number of 33 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65787320201) 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, 1187651 + ... + 1241808.

It is an arithmetic number, because the mean of its divisors is an integer number (8860240620).

Almost surely, 2^65787320261 is an apocalyptic number.

It is an amenable number.

65787320261 is a deficient number, since it is larger than the sum of its proper divisors (5094604699).

65787320261 is a wasteful number, since it uses less digits than its factorization.

65787320261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2431555.

The product of its (nonzero) digits is 846720, while the sum is 47.

The spelling of 65787320261 in words is "sixty-five billion, seven hundred eighty-seven million, three hundred twenty thousand, two hundred sixty-one".