16705287457 has 4 divisors (see below), whose sum is σ = 16708618240. Its totient is φ = 16701956676.

The previous prime is 16705287449. The next prime is 16705287463. The reversal of 16705287457 is 75478250761.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 16705287457 - 2³ = 16705287449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16705287497) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1657857 + ... + 1667902.

It is an arithmetic number, because the mean of its divisors is an integer number (4177154560).

Almost surely, 2^16705287457 is an apocalyptic number.

It is an amenable number.

16705287457 is a deficient number, since it is larger than the sum of its proper divisors (3330783).

16705287457 is an equidigital number, since it uses as much as digits as its factorization.

16705287457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3330782.

The product of its (nonzero) digits is 3292800, while the sum is 52.

The spelling of 16705287457 in words is "sixteen billion, seven hundred five million, two hundred eighty-seven thousand, four hundred fifty-seven".