1275841782642 has 128 divisors (see below), whose sum is σ = 3222872064000. Its totient is φ = 328078181376.

The previous prime is 1275841782613. The next prime is 1275841782643. The reversal of 1275841782642 is 2462871485721.

It is not an unprimeable number, because it can be changed into a prime (1275841782643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 78801084 + ... + 78817272.

It is an arithmetic number, because the mean of its divisors is an integer number (25178688000).

Almost surely, 2^{1275841782642} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1275841782642, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1611436032000).

1275841782642 is an abundant number, since it is smaller than the sum of its proper divisors (1947030281358).

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

1275841782642 is a wasteful number, since it uses less digits than its factorization.

1275841782642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21040.

The product of its digits is 12042240, while the sum is 57.

The spelling of 1275841782642 in words is "one trillion, two hundred seventy-five billion, eight hundred forty-one million, seven hundred eighty-two thousand, six hundred forty-two".