16840464257 has 2 divisors, whose sum is σ = 16840464258. Its totient is φ = 16840464256.

The previous prime is 16840464217. The next prime is 16840464269. The reversal of 16840464257 is 75246404861.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14865461776 + 1975002481 = 121924^2 + 44441^2 .

It is a cyclic number.

It is not a de Polignac number, because 16840464257 - 2¹⁴ = 16840447873 is a prime.

It is not a weakly prime, because it can be changed into another prime (16840464217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8420232128 + 8420232129.

It is an arithmetic number, because the mean of its divisors is an integer number (8420232129).

Almost surely, 2^16840464257 is an apocalyptic number.

It is an amenable number.

16840464257 is a deficient number, since it is larger than the sum of its proper divisors (1).

16840464257 is an equidigital number, since it uses as much as digits as its factorization.

16840464257 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1290240, while the sum is 47.

The spelling of 16840464257 in words is "sixteen billion, eight hundred forty million, four hundred sixty-four thousand, two hundred fifty-seven".