65783945821 has 8 divisors (see below), whose sum is σ = 71775288288. Its totient is φ = 59794434000.

The previous prime is 65783945809. The next prime is 65783945827. The reversal of 65783945821 is 12854938756.

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 65783945821 - 2¹¹ = 65783943773 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65783945827) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 381975 + ... + 526756.

It is an arithmetic number, because the mean of its divisors is an integer number (8971911036).

Almost surely, 2^65783945821 is an apocalyptic number.

It is an amenable number.

65783945821 is a deficient number, since it is larger than the sum of its proper divisors (5991342467).

65783945821 is a wasteful number, since it uses less digits than its factorization.

65783945821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 915323.

The product of its digits is 14515200, while the sum is 58.

The spelling of 65783945821 in words is "sixty-five billion, seven hundred eighty-three million, nine hundred forty-five thousand, eight hundred twenty-one".