16247785384657 has 2 divisors, whose sum is σ = 16247785384658. Its totient is φ = 16247785384656.

The previous prime is 16247785384643. The next prime is 16247785384711. The reversal of 16247785384657 is 75648358774261.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15280898628241 + 966886756416 = 3909079^2 + 983304^2 .

It is a cyclic number.

It is not a de Polignac number, because 16247785384657 - 2²³ = 16247776996049 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 16247785384657.

It is not a weakly prime, because it can be changed into another prime (16247785384637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8123892692328 + 8123892692329.

It is an arithmetic number, because the mean of its divisors is an integer number (8123892692329).

Almost surely, 2^{16247785384657} is an apocalyptic number.

It is an amenable number.

16247785384657 is a deficient number, since it is larger than the sum of its proper divisors (1).

16247785384657 is an equidigital number, since it uses as much as digits as its factorization.

16247785384657 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1896652800, while the sum is 73.

The spelling of 16247785384657 in words is "sixteen trillion, two hundred forty-seven billion, seven hundred eighty-five million, three hundred eighty-four thousand, six hundred fifty-seven".