817121226480 has 160 divisors (see below), whose sum is σ = 2728526154816. Its totient is φ = 201093414912.

The previous prime is 817121226433. The next prime is 817121226497. The reversal of 817121226480 is 84622121718.

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 31 ways as a sum of consecutive naturals, for example, 15551934 + ... + 15604386.

Almost surely, 2^817121226480 is an apocalyptic number.

817121226480 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 817121226480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1364263077408).

817121226480 is an abundant number, since it is smaller than the sum of its proper divisors (1911404928336).

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

817121226480 is a wasteful number, since it uses less digits than its factorization.

817121226480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57475 (or 57469 counting only the distinct ones).

The product of its (nonzero) digits is 86016, while the sum is 42.

The spelling of 817121226480 in words is "eight hundred seventeen billion, one hundred twenty-one million, two hundred twenty-six thousand, four hundred eighty".