816256954403 has 12 divisors (see below), whose sum is σ = 944429536680. Its totient is φ = 702996418080.

The previous prime is 816256954393. The next prime is 816256954417. The reversal of 816256954403 is 304459652618.

It is a happy number.

It is not a de Polignac number, because 816256954403 - 2¹⁸ = 816256692259 is a prime.

It is a super-2 number, since 2×816256954403² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (816256950403) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 177522050 + ... + 177526647.

It is an arithmetic number, because the mean of its divisors is an integer number (78702461390).

Almost surely, 2^816256954403 is an apocalyptic number.

816256954403 is a deficient number, since it is larger than the sum of its proper divisors (128172582277).

816256954403 is a wasteful number, since it uses less digits than its factorization.

816256954403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 355048738 (or 355048727 counting only the distinct ones).

The product of its (nonzero) digits is 6220800, while the sum is 53.

The spelling of 816256954403 in words is "eight hundred sixteen billion, two hundred fifty-six million, nine hundred fifty-four thousand, four hundred three".