65772339391 has 4 divisors (see below), whose sum is σ = 71751642984. Its totient is φ = 59793035800.

The previous prime is 65772339343. The next prime is 65772339407. The reversal of 65772339391 is 19393327756.

65772339391 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 65772339391 - 2¹³ = 65772331199 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65772339491) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2989651780 + ... + 2989651801.

It is an arithmetic number, because the mean of its divisors is an integer number (17937910746).

Almost surely, 2^65772339391 is an apocalyptic number.

65772339391 is a deficient number, since it is larger than the sum of its proper divisors (5979303593).

65772339391 is a wasteful number, since it uses less digits than its factorization.

65772339391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5979303592.

The product of its digits is 6429780, while the sum is 55.

The spelling of 65772339391 in words is "sixty-five billion, seven hundred seventy-two million, three hundred thirty-nine thousand, three hundred ninety-one".