1681016773 has 4 divisors (see below), whose sum is σ = 1769491360. Its totient is φ = 1592542188.

The previous prime is 1681016749. The next prime is 1681016791. The reversal of 1681016773 is 3776101861.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1681016773 is a prime.

It is a super-2 number, since 2×1681016773² = 5651634782214667058, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1681016723) 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, 44237265 + ... + 44237302.

It is an arithmetic number, because the mean of its divisors is an integer number (442372840).

Almost surely, 2^1681016773 is an apocalyptic number.

It is an amenable number.

1681016773 is a deficient number, since it is larger than the sum of its proper divisors (88474587).

1681016773 is an equidigital number, since it uses as much as digits as its factorization.

1681016773 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88474586.

The product of its (nonzero) digits is 42336, while the sum is 40.

The square root of 1681016773 is about 41000.2045482702. The cubic root of 1681016773 is about 1189.0241683511.

The spelling of 1681016773 in words is "one billion, six hundred eighty-one million, sixteen thousand, seven hundred seventy-three".