8251645872440 has 32 divisors (see below), whose sum is σ = 18566902514160. Its totient is φ = 3300534028800.

The previous prime is 8251645872433. The next prime is 8251645872451. The reversal of 8251645872440 is 442785461528.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2806046 + ... + 4937325.

Almost surely, 2^{8251645872440} is an apocalyptic number.

It is an amenable number.

8251645872440 is an abundant number, since it is smaller than the sum of its proper divisors (10315256641720).

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

8251645872440 is a wasteful number, since it uses less digits than its factorization.

8251645872440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7770023 (or 7770019 counting only the distinct ones).

The product of its (nonzero) digits is 17203200, while the sum is 56.

The spelling of 8251645872440 in words is "eight trillion, two hundred fifty-one billion, six hundred forty-five million, eight hundred seventy-two thousand, four hundred forty".