1618503344640 has 2560 divisors, whose sum is σ = 7721505792000. Its totient is φ = 311688953856.

The previous prime is 1618503344639. The next prime is 1618503344663. The reversal of 1618503344640 is 464433058161.

1618503344640 is a `hidden beast` number, since 1 + 6 + 185 + 0 + 3 + 3 + 4 + 464 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (2560).

It is a super-2 number, since 2×1618503344640² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 255 ways as a sum of consecutive naturals, for example, 3465745687 + ... + 3465746153.

It is an arithmetic number, because the mean of its divisors is an integer number (3016213200).

Almost surely, 2^{1618503344640} is an apocalyptic number.

1618503344640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1618503344640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3860752896000).

1618503344640 is an abundant number, since it is smaller than the sum of its proper divisors (6103002447360).

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

1618503344640 is a wasteful number, since it uses less digits than its factorization.

1618503344640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 567 (or 545 counting only the distinct ones).

The product of its (nonzero) digits is 829440, while the sum is 45.

The spelling of 1618503344640 in words is "one trillion, six hundred eighteen billion, five hundred three million, three hundred forty-four thousand, six hundred forty".