97217855826 has 128 divisors (see below), whose sum is σ = 257042688000. Its totient is φ = 24290280000.

The previous prime is 97217855809. The next prime is 97217855843. The reversal of 97217855826 is 62855871279.

It is an interprime number because it is at equal distance from previous prime (97217855809) and next prime (97217855843).

It is a super-2 number, since 2×97217855826² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 97217855826.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 412701 + ... + 603951.

It is an arithmetic number, because the mean of its divisors is an integer number (2008146000).

Almost surely, 2^97217855826 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 97217855826, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (128521344000).

97217855826 is an abundant number, since it is smaller than the sum of its proper divisors (159824832174).

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

97217855826 is a wasteful number, since it uses less digits than its factorization.

97217855826 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 191309 (or 191295 counting only the distinct ones).

The product of its digits is 16934400, while the sum is 60.

The spelling of 97217855826 in words is "ninety-seven billion, two hundred seventeen million, eight hundred fifty-five thousand, eight hundred twenty-six".