1781370465540 has 96 divisors (see below), whose sum is σ = 5050027745280. Its totient is φ = 469145020800.

The previous prime is 1781370465517. The next prime is 1781370465559. The reversal of 1781370465540 is 455640731871.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1033795 + ... + 2152085.

It is an arithmetic number, because the mean of its divisors is an integer number (52604455680).

Almost surely, 2^{1781370465540} is an apocalyptic number.

1781370465540 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 1781370465540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2525013872640).

1781370465540 is an abundant number, since it is smaller than the sum of its proper divisors (3268657279740).

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

1781370465540 is a wasteful number, since it uses less digits than its factorization.

1781370465540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1118633 (or 1118631 counting only the distinct ones).

The product of its (nonzero) digits is 2822400, while the sum is 51.

The spelling of 1781370465540 in words is "one trillion, seven hundred eighty-one billion, three hundred seventy million, four hundred sixty-five thousand, five hundred forty".