1681165747 has 4 divisors (see below), whose sum is σ = 1701420840. Its totient is φ = 1660910656.

The previous prime is 1681165729. The next prime is 1681165753. The reversal of 1681165747 is 7475611861.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1681165747 - 2¹¹ = 1681163699 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1681165697 and 1681165706.

It is not an unprimeable number, because it can be changed into a prime (1681163747) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10127422 + ... + 10127587.

It is an arithmetic number, because the mean of its divisors is an integer number (425355210).

Almost surely, 2^1681165747 is an apocalyptic number.

1681165747 is a deficient number, since it is larger than the sum of its proper divisors (20255093).

1681165747 is an equidigital number, since it uses as much as digits as its factorization.

1681165747 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20255092.

The product of its digits is 282240, while the sum is 46.

The square root of 1681165747 is about 41002.0212550552. The cubic root of 1681165747 is about 1189.0592916283.

The spelling of 1681165747 in words is "one billion, six hundred eighty-one million, one hundred sixty-five thousand, seven hundred forty-seven".