1009909388556 has 24 divisors (see below), whose sum is σ = 2618283600240. Its totient is φ = 336636462816.

The previous prime is 1009909388539. The next prime is 1009909388563. The reversal of 1009909388556 is 6558839099001.

It is a junction number, because it is equal to n+sod(n) for n = 1009909388493 and 1009909388502.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4675506321 + ... + 4675506536.

It is an arithmetic number, because the mean of its divisors is an integer number (109095150010).

Almost surely, 2^{1009909388556} is an apocalyptic number.

It is an amenable number.

1009909388556 is an abundant number, since it is smaller than the sum of its proper divisors (1608374211684).

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

1009909388556 is a wasteful number, since it uses less digits than its factorization.

1009909388556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9351012870 (or 9351012862 counting only the distinct ones).

The product of its (nonzero) digits is 20995200, while the sum is 63.

It can be divided in two parts, 100990 and 9388556, that added together give a triangular number (9489546 = T₄₃₅₆).

The spelling of 1009909388556 in words is "one trillion, nine billion, nine hundred nine million, three hundred eighty-eight thousand, five hundred fifty-six".