1781445801642 has 48 divisors (see below), whose sum is σ = 3923433067680. Its totient is φ = 538846691136.

The previous prime is 1781445801637. The next prime is 1781445801659. The reversal of 1781445801642 is 2461085441871.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14828733 + ... + 14948384.

It is an arithmetic number, because the mean of its divisors is an integer number (81738188910).

Almost surely, 2^{1781445801642} is an apocalyptic number.

1781445801642 is an abundant number, since it is smaller than the sum of its proper divisors (2141987266038).

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

1781445801642 is a wasteful number, since it uses less digits than its factorization.

1781445801642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29777207 (or 29777194 counting only the distinct ones).

The product of its (nonzero) digits is 1720320, while the sum is 51.

The spelling of 1781445801642 in words is "one trillion, seven hundred eighty-one billion, four hundred forty-five million, eight hundred one thousand, six hundred forty-two".