1481597781840 has 400 divisors, whose sum is σ = 5650826645376. Its totient is φ = 356793984000.

The previous prime is 1481597781817. The next prime is 1481597781857. The reversal of 1481597781840 is 481877951841.

1481597781840 is a `hidden beast` number, since 1 + 481 + 5 + 9 + 7 + 78 + 1 + 84 + 0 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 10694454 + ... + 10832106.

Almost surely, 2^{1481597781840} is an apocalyptic number.

1481597781840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1481597781840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2825413322688).

1481597781840 is an abundant number, since it is smaller than the sum of its proper divisors (4169228863536).

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

1481597781840 is a wasteful number, since it uses less digits than its factorization.

1481597781840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137840 (or 137825 counting only the distinct ones).

The product of its (nonzero) digits is 18063360, while the sum is 63.

The spelling of 1481597781840 in words is "one trillion, four hundred eighty-one billion, five hundred ninety-seven million, seven hundred eighty-one thousand, eight hundred forty".