1681257446 has 16 divisors (see below), whose sum is σ = 2895946560. Its totient is φ = 723986280.

The previous prime is 1681257419. The next prime is 1681257463. The reversal of 1681257446 is 6447521861.

It is a junction number, because it is equal to n+sod(n) for n = 1681257397 and 1681257406.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2010656 + ... + 2011491.

It is an arithmetic number, because the mean of its divisors is an integer number (180996660).

Almost surely, 2^1681257446 is an apocalyptic number.

1681257446 is a deficient number, since it is larger than the sum of its proper divisors (1214689114).

1681257446 is a wasteful number, since it uses less digits than its factorization.

1681257446 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4022179.

The product of its digits is 322560, while the sum is 44.

The square root of 1681257446 is about 41003.1394651678. The cubic root of 1681257446 is about 1189.0809102711.

It can be divided in two parts, 168125 and 7446, that added together give a palindrome (175571).

The spelling of 1681257446 in words is "one billion, six hundred eighty-one million, two hundred fifty-seven thousand, four hundred forty-six".