1681469568 has 48 divisors (see below), whose sum is σ = 4838607150. Its totient is φ = 560489472.

The previous prime is 1681469563. The next prime is 1681469597. The reversal of 1681469568 is 8659641861.

1681469568 is a `hidden beast` number, since 1 + 6 + 8 + 14 + 69 + 568 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1425213504 + 256256064 = 37752^2 + 16008^2 .

It is a tau number, because it is divible by the number of its divisors (48).

It is a super-2 number, since 2×1681469568² = 5654679816220213248, which contains 22 as substring.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (1681469563) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 728653 + ... + 730956.

Almost surely, 2^1681469568 is an apocalyptic number.

1681469568 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1681469568 is an abundant number, since it is smaller than the sum of its proper divisors (3157137582).

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

1681469568 is a wasteful number, since it uses less digits than its factorization.

1681469568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1459629 (or 1459614 counting only the distinct ones).

The product of its digits is 2488320, while the sum is 54.

The square root of 1681469568 is about 41005.7260391765. The cubic root of 1681469568 is about 1189.1309164167.

The spelling of 1681469568 in words is "one billion, six hundred eighty-one million, four hundred sixty-nine thousand, five hundred sixty-eight".