1691044413861 has 8 divisors (see below), whose sum is σ = 2459700965664. Its totient is φ = 1024875402320.

The previous prime is 1691044413853. The next prime is 1691044413943. The reversal of 1691044413861 is 1683144401961.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1691044413861 - 2³ = 1691044413853 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1691044413861.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1691044413361) 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 7 ways as a sum of consecutive naturals, for example, 25621885026 + ... + 25621885091.

It is an arithmetic number, because the mean of its divisors is an integer number (307462620708).

Almost surely, 2^{1691044413861} is an apocalyptic number.

1691044413861 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1691044413861 is a deficient number, since it is larger than the sum of its proper divisors (768656551803).

1691044413861 is a wasteful number, since it uses less digits than its factorization.

1691044413861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51243770131.

The product of its (nonzero) digits is 497664, while the sum is 48.

The spelling of 1691044413861 in words is "one trillion, six hundred ninety-one billion, forty-four million, four hundred thirteen thousand, eight hundred sixty-one".