817373442640 has 80 divisors (see below), whose sum is σ = 1906246385280. Its totient is φ = 325943170560.

The previous prime is 817373442637. The next prime is 817373442727. The reversal of 817373442640 is 46244373718.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is an unprimeable number.

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, 92805117 + ... + 92813923.

It is an arithmetic number, because the mean of its divisors is an integer number (23828079816).

Almost surely, 2^817373442640 is an apocalyptic number.

817373442640 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

817373442640 is an abundant number, since it is smaller than the sum of its proper divisors (1088872942640).

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

817373442640 is a wasteful number, since it uses less digits than its factorization.

817373442640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12260 (or 12254 counting only the distinct ones).

The product of its (nonzero) digits is 2709504, while the sum is 49.

The spelling of 817373442640 in words is "eight hundred seventeen billion, three hundred seventy-three million, four hundred forty-two thousand, six hundred forty".