1855420613553 has 64 divisors (see below), whose sum is σ = 2844931541760. Its totient is φ = 1067180147712.

The previous prime is 1855420613539. The next prime is 1855420613569. The reversal of 1855420613553 is 3553160245581.

It is not a de Polignac number, because 1855420613553 - 2⁴ = 1855420613537 is a prime.

It is a super-3 number, since 3×1855420613553³ (a number of 38 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (1855420613503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 8131326 + ... + 8356392.

It is an arithmetic number, because the mean of its divisors is an integer number (44452055340).

Almost surely, 2^{1855420613553} is an apocalyptic number.

1855420613553 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1855420613553 is a deficient number, since it is larger than the sum of its proper divisors (989510928207).

1855420613553 is a wasteful number, since it uses less digits than its factorization.

1855420613553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 225346.

The product of its (nonzero) digits is 2160000, while the sum is 48.

The spelling of 1855420613553 in words is "one trillion, eight hundred fifty-five billion, four hundred twenty million, six hundred thirteen thousand, five hundred fifty-three".