1681058156489 has 4 divisors (see below), whose sum is σ = 1681079645124. Its totient is φ = 1681036667856.

The previous prime is 1681058156443. The next prime is 1681058156537. The reversal of 1681058156489 is 9846518501861.

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 889550785600 + 791507370889 = 943160^2 + 889667^2 .

It is a cyclic number.

It is not a de Polignac number, because 1681058156489 - 2¹⁶ = 1681058090953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1681058156189) 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, 10626542 + ... + 10783575.

It is an arithmetic number, because the mean of its divisors is an integer number (420269911281).

Almost surely, 2^{1681058156489} is an apocalyptic number.

It is an amenable number.

1681058156489 is a deficient number, since it is larger than the sum of its proper divisors (21488635).

1681058156489 is an equidigital number, since it uses as much as digits as its factorization.

1681058156489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21488634.

The product of its (nonzero) digits is 16588800, while the sum is 62.

The spelling of 1681058156489 in words is "one trillion, six hundred eighty-one billion, fifty-eight million, one hundred fifty-six thousand, four hundred eighty-nine".