1855205055387 has 12 divisors (see below), whose sum is σ = 2679813353880. Its totient is φ = 1236769807968.

The previous prime is 1855205055323. The next prime is 1855205055461. The reversal of 1855205055387 is 7835505025581.

1855205055387 is a `hidden beast` number, since 1 + 8 + 5 + 5 + 2 + 0 + 5 + 0 + 553 + 87 = 666.

It is not a de Polignac number, because 1855205055387 - 2⁶ = 1855205055323 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1855205054387) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2444437 + ... + 3112182.

It is an arithmetic number, because the mean of its divisors is an integer number (223317779490).

Almost surely, 2^{1855205055387} is an apocalyptic number.

1855205055387 is a deficient number, since it is larger than the sum of its proper divisors (824608298493).

1855205055387 is a wasteful number, since it uses less digits than its factorization.

1855205055387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5593722 (or 5593719 counting only the distinct ones).

The product of its (nonzero) digits is 8400000, while the sum is 54.

The spelling of 1855205055387 in words is "one trillion, eight hundred fifty-five billion, two hundred five million, fifty-five thousand, three hundred eighty-seven".