16235856397 has 2 divisors, whose sum is σ = 16235856398. Its totient is φ = 16235856396.

The previous prime is 16235856361. The next prime is 16235856449. The reversal of 16235856397 is 79365853261.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15329906596 + 905949801 = 123814^2 + 30099^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16235856397 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16235856317) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8117928198 + 8117928199.

It is an arithmetic number, because the mean of its divisors is an integer number (8117928199).

Almost surely, 2^16235856397 is an apocalyptic number.

It is an amenable number.

16235856397 is a deficient number, since it is larger than the sum of its proper divisors (1).

16235856397 is an equidigital number, since it uses as much as digits as its factorization.

16235856397 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8164800, while the sum is 55.

The spelling of 16235856397 in words is "sixteen billion, two hundred thirty-five million, eight hundred fifty-six thousand, three hundred ninety-seven".