8173121303640 has 128 divisors (see below), whose sum is σ = 25139900560320. Its totient is φ = 2124435456000.

The previous prime is 8173121303561. The next prime is 8173121303687. The reversal of 8173121303640 is 463031213718.

It is a super-3 number, since 3×8173121303640³ (a number of 40 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4752040 + ... + 6239240.

Almost surely, 2^{8173121303640} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 8173121303640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12569950280160).

8173121303640 is an abundant number, since it is smaller than the sum of its proper divisors (16966779256680).

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

8173121303640 is a wasteful number, since it uses less digits than its factorization.

8173121303640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1488373 (or 1488369 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 39.

The spelling of 8173121303640 in words is "eight trillion, one hundred seventy-three billion, one hundred twenty-one million, three hundred three thousand, six hundred forty".