1809119555406 has 48 divisors (see below), whose sum is σ = 4105182292848. Its totient is φ = 597069144000.

The previous prime is 1809119555359. The next prime is 1809119555413. The reversal of 1809119555406 is 6045559119081.

It is a happy number.

1809119555406 is a `hidden beast` number, since 1 + 8 + 0 + 9 + 1 + 1 + 95 + 5 + 540 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18378975 + ... + 18477146.

It is an arithmetic number, because the mean of its divisors is an integer number (85524631101).

Almost surely, 2^{1809119555406} is an apocalyptic number.

1809119555406 is an abundant number, since it is smaller than the sum of its proper divisors (2296062737442).

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

1809119555406 is a wasteful number, since it uses less digits than its factorization.

1809119555406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36856239 (or 36856227 counting only the distinct ones).

The product of its (nonzero) digits is 1944000, while the sum is 54.

The spelling of 1809119555406 in words is "one trillion, eight hundred nine billion, one hundred nineteen million, five hundred fifty-five thousand, four hundred six".