1121781586644 has 96 divisors (see below), whose sum is σ = 2941303572480. Its totient is φ = 369710697600.

The previous prime is 1121781586631. The next prime is 1121781586687. The reversal of 1121781586644 is 4466851871211.

1121781586644 is a `hidden beast` number, since 1 + 1 + 2 + 17 + 8 + 1 + 586 + 6 + 44 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent 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, 3215949 + ... + 3547659.

It is an arithmetic number, because the mean of its divisors is an integer number (30638578880).

Almost surely, 2^{1121781586644} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1121781586644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1470651786240).

1121781586644 is an abundant number, since it is smaller than the sum of its proper divisors (1819521985836).

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

1121781586644 is a wasteful number, since it uses less digits than its factorization.

1121781586644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 332078 (or 332070 counting only the distinct ones).

The product of its digits is 2580480, while the sum is 54.

The spelling of 1121781586644 in words is "one trillion, one hundred twenty-one billion, seven hundred eighty-one million, five hundred eighty-six thousand, six hundred forty-four".