7871781450544 has 40 divisors (see below), whose sum is σ = 16838542389312. Its totient is φ = 3534973043520.

The previous prime is 7871781450451. The next prime is 7871781450569. The reversal of 7871781450544 is 4450541871787.

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, 269419314 + ... + 269448529.

Almost surely, 2^{7871781450544} is an apocalyptic number.

It is an amenable number.

7871781450544 is an abundant number, since it is smaller than the sum of its proper divisors (8966760938768).

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

7871781450544 is a wasteful number, since it uses less digits than its factorization.

7871781450544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 538867945 (or 538867939 counting only the distinct ones).

The product of its (nonzero) digits is 35123200, while the sum is 61.

The spelling of 7871781450544 in words is "seven trillion, eight hundred seventy-one billion, seven hundred eighty-one million, four hundred fifty thousand, five hundred forty-four".