1681668426 has 32 divisors (see below), whose sum is σ = 3479152320. Its totient is φ = 541472256.

The previous prime is 1681668421. The next prime is 1681668451. The reversal of 1681668426 is 6248661861.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1681668421) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3610 + ... + 58106.

It is an arithmetic number, because the mean of its divisors is an integer number (108723510).

Almost surely, 2^1681668426 is an apocalyptic number.

1681668426 is an abundant number, since it is smaller than the sum of its proper divisors (1797483894).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1681668426 is a wasteful number, since it uses less digits than its factorization.

1681668426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54678.

The product of its digits is 663552, while the sum is 48.

The square root of 1681668426 is about 41008.1507264105. The cubic root of 1681668426 is about 1189.1777918561.

The spelling of 1681668426 in words is "one billion, six hundred eighty-one million, six hundred sixty-eight thousand, four hundred twenty-six".