815699108322 has 378 divisors, whose sum is σ = 2225465795889. Its totient is φ = 223469759520.

The previous prime is 815699108299. The next prime is 815699108327. The reversal of 815699108322 is 223801996518.

815699108322 is a `hidden beast` number, since 81 + 56 + 99 + 108 + 322 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 782710014681 + 32989093641 = 884709^2 + 181629^2 .

It is a tau number, because it is divible by the number of its divisors (378).

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=638631.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (815699108327) by changing a digit.

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 188 ways as a sum of consecutive naturals, for example, 7483478004 + ... + 7483478112.

Almost surely, 2^815699108322 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 815699108322

815699108322 is an abundant number, since it is smaller than the sum of its proper divisors (1409766687567).

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

815699108322 is an equidigital number, since it uses as much as digits as its factorization.

815699108322 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 314 (or 152 counting only the distinct ones).

The product of its (nonzero) digits is 1866240, while the sum is 54.

The spelling of 815699108322 in words is "eight hundred fifteen billion, six hundred ninety-nine million, one hundred eight thousand, three hundred twenty-two".