1020231355644 has 144 divisors (see below), whose sum is σ = 2723893046784. Its totient is φ = 321344496000.

The previous prime is 1020231355613. The next prime is 1020231355657. The reversal of 1020231355644 is 4465531320201.

1020231355644 is a `hidden beast` number, since 1 + 0 + 2 + 0 + 2 + 3 + 1 + 3 + 5 + 5 + 644 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 1020231355599 and 1020231355608.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 22607527 + ... + 22652609.

It is an arithmetic number, because the mean of its divisors is an integer number (18915923936).

Almost surely, 2^{1020231355644} 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 1020231355644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1361946523392).

1020231355644 is an abundant number, since it is smaller than the sum of its proper divisors (1703661691140).

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

1020231355644 is a wasteful number, since it uses less digits than its factorization.

1020231355644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45448 (or 45443 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 36.

Adding to 1020231355644 its reverse (4465531320201), we get a palindrome (5485762675845).

The spelling of 1020231355644 in words is "one trillion, twenty billion, two hundred thirty-one million, three hundred fifty-five thousand, six hundred forty-four".