1681209935394 has 64 divisors (see below), whose sum is σ = 3988834077312. Its totient is φ = 466530278400.

The previous prime is 1681209935369. The next prime is 1681209935407. The reversal of 1681209935394 is 4935399021861.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 20207197 + ... + 20290224.

It is an arithmetic number, because the mean of its divisors is an integer number (62325532458).

Almost surely, 2^{1681209935394} is an apocalyptic number.

1681209935394 is an abundant number, since it is smaller than the sum of its proper divisors (2307624141918).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1681209935394 is a wasteful number, since it uses less digits than its factorization.

1681209935394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40497491.

The product of its (nonzero) digits is 12597120, while the sum is 60.

The spelling of 1681209935394 in words is "one trillion, six hundred eighty-one billion, two hundred nine million, nine hundred thirty-five thousand, three hundred ninety-four".