65855791 has 2 divisors, whose sum is σ = 65855792. Its totient is φ = 65855790.

The previous prime is 65855771. The next prime is 65855821. The reversal of 65855791 is 19755856.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 65855791 - 2⁵ = 65855759 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65855771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32927895 + 32927896.

It is an arithmetic number, because the mean of its divisors is an integer number (32927896).

Almost surely, 2^65855791 is an apocalyptic number.

65855791 is a deficient number, since it is larger than the sum of its proper divisors (1).

65855791 is an equidigital number, since it uses as much as digits as its factorization.

65855791 is an evil number, because the sum of its binary digits is even.

The product of its digits is 378000, while the sum is 46.

The square root of 65855791 is about 8115.1581007396. The cubic root of 65855791 is about 403.8294524887.

The spelling of 65855791 in words is "sixty-five million, eight hundred fifty-five thousand, seven hundred ninety-one".