1011993208556 has 108 divisors (see below), whose sum is σ = 2071834378488. Its totient is φ = 432404438400.

The previous prime is 1011993208529. The next prime is 1011993208571. The reversal of 1011993208556 is 6558023991101.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1247833391 + ... + 1247834201.

Almost surely, 2^{1011993208556} is an apocalyptic number.

It is an amenable number.

1011993208556 is an abundant number, since it is smaller than the sum of its proper divisors (1059841169932).

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

1011993208556 is an frugal number, since it uses more digits than its factorization.

1011993208556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1693 (or 841 counting only the distinct ones).

The product of its (nonzero) digits is 583200, while the sum is 50.

The spelling of 1011993208556 in words is "one trillion, eleven billion, nine hundred ninety-three million, two hundred eight thousand, five hundred fifty-six".