1691100168121 has 48 divisors (see below), whose sum is σ = 2146490660160. Its totient is φ = 1320435043200.

The previous prime is 1691100168103. The next prime is 1691100168253. The reversal of 1691100168121 is 1218610011961.

It is not a de Polignac number, because 1691100168121 - 2⁵ = 1691100168089 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1691100163121) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 19708650 + ... + 19794268.

It is an arithmetic number, because the mean of its divisors is an integer number (44718555420).

Almost surely, 2^{1691100168121} is an apocalyptic number.

It is an amenable number.

1691100168121 is a deficient number, since it is larger than the sum of its proper divisors (455390492039).

1691100168121 is a wasteful number, since it uses less digits than its factorization.

1691100168121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86054 (or 86047 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 37.

The spelling of 1691100168121 in words is "one trillion, six hundred ninety-one billion, one hundred million, one hundred sixty-eight thousand, one hundred twenty-one".