1681306850149 has 4 divisors (see below), whose sum is σ = 1739282948460. Its totient is φ = 1623330751840.

The previous prime is 1681306850143. The next prime is 1681306850189. The reversal of 1681306850149 is 9410586031861.

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

It can be written as a sum of positive squares in 2 ways, for example, as 840142727649 + 841164122500 = 916593^2 + 917150^2 .

It is a cyclic number.

It is not a de Polignac number, because 1681306850149 - 2⁵ = 1681306850117 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1681306850096 and 1681306850105.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1681306850143) 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, 28988049112 + ... + 28988049169.

It is an arithmetic number, because the mean of its divisors is an integer number (434820737115).

Almost surely, 2^{1681306850149} is an apocalyptic number.

It is an amenable number.

1681306850149 is a deficient number, since it is larger than the sum of its proper divisors (57976098311).

1681306850149 is an equidigital number, since it uses as much as digits as its factorization.

1681306850149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57976098310.

The product of its (nonzero) digits is 1244160, while the sum is 52.

The spelling of 1681306850149 in words is "one trillion, six hundred eighty-one billion, three hundred six million, eight hundred fifty thousand, one hundred forty-nine".