1697813983921 has 16 divisors (see below), whose sum is σ = 1866408350400. Its totient is φ = 1531595603200.

The previous prime is 1697813983909. The next prime is 1697813983949. The reversal of 1697813983921 is 1293893187961.

It is a cyclic number.

It is not a de Polignac number, because 1697813983921 - 2⁷ = 1697813983793 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1697813983981) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 46106565 + ... + 46143373.

It is an arithmetic number, because the mean of its divisors is an integer number (116650521900).

Almost surely, 2^{1697813983921} is an apocalyptic number.

1697813983921 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1697813983921 is a deficient number, since it is larger than the sum of its proper divisors (168594366479).

1697813983921 is a wasteful number, since it uses less digits than its factorization.

1697813983921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68960.

The product of its digits is 35271936, while the sum is 67.

The spelling of 1697813983921 in words is "one trillion, six hundred ninety-seven billion, eight hundred thirteen million, nine hundred eighty-three thousand, nine hundred twenty-one".