2581447969840 has 40 divisors (see below), whose sum is σ = 6042147541200. Its totient is φ = 1025649121536.

The previous prime is 2581447969829. The next prime is 2581447969853. The reversal of 2581447969840 is 489697441852.

It is a tau number, because it is divible by the number of its divisors (40).

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, 108270294 + ... + 108294133.

It is an arithmetic number, because the mean of its divisors is an integer number (151053688530).

Almost surely, 2^{2581447969840} is an apocalyptic number.

2581447969840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2581447969840 is an abundant number, since it is smaller than the sum of its proper divisors (3460699571360).

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

2581447969840 is a wasteful number, since it uses less digits than its factorization.

2581447969840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 216564589 (or 216564583 counting only the distinct ones).

The product of its (nonzero) digits is 139345920, while the sum is 67.

The spelling of 2581447969840 in words is "two trillion, five hundred eighty-one billion, four hundred forty-seven million, nine hundred sixty-nine thousand, eight hundred forty".