1018643393550 has 96 divisors (see below), whose sum is σ = 2562576770304. Its totient is φ = 267732864000.

The previous prime is 1018643393533. The next prime is 1018643393633. The reversal of 1018643393550 is 553933468101.

1018643393550 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1018643393550.

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, 41597310 + ... + 41621790.

It is an arithmetic number, because the mean of its divisors is an integer number (26693508024).

Almost surely, 2^{1018643393550} is an apocalyptic number.

1018643393550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1018643393550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1281288385152).

1018643393550 is an abundant number, since it is smaller than the sum of its proper divisors (1543933376754).

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

1018643393550 is a wasteful number, since it uses less digits than its factorization.

1018643393550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28474 (or 28469 counting only the distinct ones).

The product of its (nonzero) digits is 1166400, while the sum is 48.

The spelling of 1018643393550 in words is "one trillion, eighteen billion, six hundred forty-three million, three hundred ninety-three thousand, five hundred fifty".