65215823 has 2 divisors, whose sum is σ = 65215824. Its totient is φ = 65215822.

The previous prime is 65215819. The next prime is 65215831. The reversal of 65215823 is 32851256.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 65215823 - 2² = 65215819 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 65215823.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65215853) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32607911 + 32607912.

It is an arithmetic number, because the mean of its divisors is an integer number (32607912).

Almost surely, 2^65215823 is an apocalyptic number.

65215823 is a deficient number, since it is larger than the sum of its proper divisors (1).

65215823 is an equidigital number, since it uses as much as digits as its factorization.

65215823 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14400, while the sum is 32.

The square root of 65215823 is about 8075.6314304208. The cubic root of 65215823 is about 402.5170919789.

The spelling of 65215823 in words is "sixty-five million, two hundred fifteen thousand, eight hundred twenty-three".