1681946433 has 12 divisors (see below), whose sum is σ = 2430955540. Its totient is φ = 1120615776.

The previous prime is 1681946423. The next prime is 1681946449. The reversal of 1681946433 is 3346491861.

1681946433 is a `hidden beast` number, since 168 + 19 + 46 + 433 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 792535104 + 889411329 = 28152^2 + 29823^2 .

It is not a de Polignac number, because 1681946433 - 2⁵ = 1681946401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1681946423) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 40966 + ... + 71007.

Almost surely, 2^1681946433 is an apocalyptic number.

It is an amenable number.

1681946433 is a deficient number, since it is larger than the sum of its proper divisors (749009107).

1681946433 is a wasteful number, since it uses less digits than its factorization.

1681946433 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113648 (or 113645 counting only the distinct ones).

The product of its digits is 373248, while the sum is 45.

The square root of 1681946433 is about 41011.5402417417. The cubic root of 1681946433 is about 1189.2433183553.

The spelling of 1681946433 in words is "one billion, six hundred eighty-one million, nine hundred forty-six thousand, four hundred thirty-three".