1855040555 has 4 divisors (see below), whose sum is σ = 2226048672. Its totient is φ = 1484032440.

The previous prime is 1855040549. The next prime is 1855040557. The reversal of 1855040555 is 5550405581.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5550405581 = 7 ⋅792915083.

It is not a de Polignac number, because 1855040555 - 2⁶ = 1855040491 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1855040557) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 185504051 + ... + 185504060.

It is an arithmetic number, because the mean of its divisors is an integer number (556512168).

Almost surely, 2^1855040555 is an apocalyptic number.

1855040555 is a deficient number, since it is larger than the sum of its proper divisors (371008117).

1855040555 is an equidigital number, since it uses as much as digits as its factorization.

1855040555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 371008116.

The product of its (nonzero) digits is 100000, while the sum is 38.

The square root of 1855040555 is about 43070.1817386461. The cubic root of 1855040555 is about 1228.7149323508.

The spelling of 1855040555 in words is "one billion, eight hundred fifty-five million, forty thousand, five hundred fifty-five".