1013785166681 has 4 divisors (see below), whose sum is σ = 1158611619072. Its totient is φ = 868958714292.

The previous prime is 1013785166593. The next prime is 1013785166699. The reversal of 1013785166681 is 1866615873101.

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 1013785166681 - 2³⁴ = 996605297497 is a prime.

It is a super-2 number, since 2×1013785166681² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1013785366681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 72413226185 + ... + 72413226198.

It is an arithmetic number, because the mean of its divisors is an integer number (289652904768).

Almost surely, 2^{1013785166681} is an apocalyptic number.

It is an amenable number.

1013785166681 is a deficient number, since it is larger than the sum of its proper divisors (144826452391).

1013785166681 is an equidigital number, since it uses as much as digits as its factorization.

1013785166681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144826452390.

The product of its (nonzero) digits is 1451520, while the sum is 53.

The spelling of 1013785166681 in words is "one trillion, thirteen billion, seven hundred eighty-five million, one hundred sixty-six thousand, six hundred eighty-one".