1836369221544 has 512 divisors, whose sum is σ = 6213434572800. Its totient is φ = 494906112000.

The previous prime is 1836369221539. The next prime is 1836369221551. The reversal of 1836369221544 is 4451229636381.

It is a happy number.

1836369221544 is a `hidden beast` number, since 1 + 8 + 3 + 6 + 3 + 6 + 92 + 2 + 1 + 544 = 666.

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

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 223099909 + ... + 223108139.

It is an arithmetic number, because the mean of its divisors is an integer number (12135614400).

Almost surely, 2^{1836369221544} 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 1836369221544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3106717286400).

1836369221544 is an abundant number, since it is smaller than the sum of its proper divisors (4377065351256).

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

1836369221544 is a wasteful number, since it uses less digits than its factorization.

1836369221544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8534 (or 8524 counting only the distinct ones).

The product of its digits is 7464960, while the sum is 54.

The spelling of 1836369221544 in words is "one trillion, eight hundred thirty-six billion, three hundred sixty-nine million, two hundred twenty-one thousand, five hundred forty-four".