817815564642340 has 96 divisors (see below), whose sum is σ = 1991674762842240. Its totient is φ = 278946044928000.

The previous prime is 817815564642269. The next prime is 817815564642367. The reversal of 817815564642340 is 43246465518718.

It is a happy number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 968140477 + ... + 968984836.

It is an arithmetic number, because the mean of its divisors is an integer number (20746612112940).

Almost surely, 2^{817815564642340} is an apocalyptic number.

It is an amenable number.

817815564642340 is an abundant number, since it is smaller than the sum of its proper divisors (1173859198199900).

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

817815564642340 is a wasteful number, since it uses less digits than its factorization.

817815564642340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1937125453 (or 1937125451 counting only the distinct ones).

The product of its (nonzero) digits is 154828800, while the sum is 64.

The spelling of 817815564642340 in words is "eight hundred seventeen trillion, eight hundred fifteen billion, five hundred sixty-four million, six hundred forty-two thousand, three hundred forty".