819905493975 has 48 divisors (see below), whose sum is σ = 1390893789600. Its totient is φ = 425925068800.

The previous prime is 819905493949. The next prime is 819905493983. The reversal of 819905493975 is 579394509918.

It is not a de Polignac number, because 819905493975 - 2¹⁰ = 819905492951 is a prime.

It is a super-2 number, since 2×819905493975² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1681201 + ... + 2113349.

It is an arithmetic number, because the mean of its divisors is an integer number (28976953950).

Almost surely, 2^819905493975 is an apocalyptic number.

819905493975 is a deficient number, since it is larger than the sum of its proper divisors (570988295625).

819905493975 is a wasteful number, since it uses less digits than its factorization.

819905493975 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 432820 (or 432815 counting only the distinct ones).

The product of its (nonzero) digits is 110224800, while the sum is 69.

The spelling of 819905493975 in words is "eight hundred nineteen billion, nine hundred five million, four hundred ninety-three thousand, nine hundred seventy-five".