1771681523117 has 4 divisors (see below), whose sum is σ = 1932743479776. Its totient is φ = 1610619566460.

The previous prime is 1771681523089. The next prime is 1771681523149. The reversal of 1771681523117 is 7113251861771.

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 not a de Polignac number, because 1771681523117 - 2¹⁴ = 1771681506733 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1771681523167) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 80530978313 + ... + 80530978334.

It is an arithmetic number, because the mean of its divisors is an integer number (483185869944).

Almost surely, 2^{1771681523117} is an apocalyptic number.

It is an amenable number.

1771681523117 is a deficient number, since it is larger than the sum of its proper divisors (161061956659).

1771681523117 is a wasteful number, since it uses less digits than its factorization.

1771681523117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161061956658.

The product of its digits is 493920, while the sum is 50.

The spelling of 1771681523117 in words is "one trillion, seven hundred seventy-one billion, six hundred eighty-one million, five hundred twenty-three thousand, one hundred seventeen".