816457223381 has 16 divisors (see below), whose sum is σ = 905008857984. Its totient is φ = 732626002944.

The previous prime is 816457223359. The next prime is 816457223429. The reversal of 816457223381 is 183322754618.

It is not a de Polignac number, because 816457223381 - 2³⁰ = 815383481557 is a prime.

It is a super-2 number, since 2×816457223381² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (816457123381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3280820 + ... + 3520893.

It is an arithmetic number, because the mean of its divisors is an integer number (56563053624).

Almost surely, 2^816457223381 is an apocalyptic number.

It is an amenable number.

816457223381 is a deficient number, since it is larger than the sum of its proper divisors (88551634603).

816457223381 is a wasteful number, since it uses less digits than its factorization.

816457223381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6802060.

The product of its digits is 1935360, while the sum is 50.

Adding to 816457223381 its reverse (183322754618), we get a palindrome (999779977999).

The spelling of 816457223381 in words is "eight hundred sixteen billion, four hundred fifty-seven million, two hundred twenty-three thousand, three hundred eighty-one".