8640240641550 has 672 divisors, whose sum is σ = 29922342942720. Its totient is φ = 1810584057600.

The previous prime is 8640240641441. The next prime is 8640240641609. The reversal of 8640240641550 is 551460420468.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a junction number, because it is equal to n+sod(n) for n = 8640240641496 and 8640240641505.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 335 ways as a sum of consecutive naturals, for example, 150254604 + ... + 150312096.

Almost surely, 2^{8640240641550} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 8640240641550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14961171471360).

8640240641550 is an abundant number, since it is smaller than the sum of its proper divisors (21282102301170).

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

8640240641550 is a wasteful number, since it uses less digits than its factorization.

8640240641550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57580 (or 57560 counting only the distinct ones).

The product of its (nonzero) digits is 921600, while the sum is 45.

The spelling of 8640240641550 in words is "eight trillion, six hundred forty billion, two hundred forty million, six hundred forty-one thousand, five hundred fifty".