1681149968 has 10 divisors (see below), whose sum is σ = 3257228094. Its totient is φ = 840574976.

The previous prime is 1681149961. The next prime is 1681149979. The reversal of 1681149968 is 8699411861.

It can be written as a sum of positive squares in only one way, i.e., 1634746624 + 46403344 = 40432^2 + 6812^2 .

It is not an unprimeable number, because it can be changed into a prime (1681149961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 52535921 + ... + 52535952.

Almost surely, 2^1681149968 is an apocalyptic number.

It is an amenable number.

1681149968 is a deficient number, since it is larger than the sum of its proper divisors (1576078126).

1681149968 is a wasteful number, since it uses less digits than its factorization.

1681149968 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105071881 (or 105071875 counting only the distinct ones).

The product of its digits is 746496, while the sum is 53.

The square root of 1681149968 is about 41001.8288372604. The cubic root of 1681149968 is about 1189.0555715459.

The spelling of 1681149968 in words is "one billion, six hundred eighty-one million, one hundred forty-nine thousand, nine hundred sixty-eight".