1681982401263 has 8 divisors (see below), whose sum is σ = 2319975726000. Its totient is φ = 1082655338688.

The previous prime is 1681982401219. The next prime is 1681982401273. The reversal of 1681982401263 is 3621042891861.

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

It is not a de Polignac number, because 1681982401263 - 2⁹ = 1681982400751 is a prime.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1681982401273) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9666565438 + ... + 9666565611.

It is an arithmetic number, because the mean of its divisors is an integer number (289996965750).

Almost surely, 2^{1681982401263} is an apocalyptic number.

1681982401263 is a deficient number, since it is larger than the sum of its proper divisors (637993324737).

1681982401263 is a wasteful number, since it uses less digits than its factorization.

1681982401263 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19333131081.

The product of its (nonzero) digits is 995328, while the sum is 51.

The spelling of 1681982401263 in words is "one trillion, six hundred eighty-one billion, nine hundred eighty-two million, four hundred one thousand, two hundred sixty-three".