1855420613539 has 2 divisors, whose sum is σ = 1855420613540. Its totient is φ = 1855420613538.

The previous prime is 1855420613537. The next prime is 1855420613569. The reversal of 1855420613539 is 9353160245581.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1855420613539 - 2¹ = 1855420613537 is a prime.

It is a super-3 number, since 3×1855420613539³ (a number of 38 digits) contains 333 as substring.

Together with 1855420613537, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1855420613537) 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 as a sum of consecutive naturals, namely, 927710306769 + 927710306770.

It is an arithmetic number, because the mean of its divisors is an integer number (927710306770).

Almost surely, 2^{1855420613539} is an apocalyptic number.

1855420613539 is a deficient number, since it is larger than the sum of its proper divisors (1).

1855420613539 is an equidigital number, since it uses as much as digits as its factorization.

1855420613539 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3888000, while the sum is 52.

The spelling of 1855420613539 in words is "one trillion, eight hundred fifty-five billion, four hundred twenty million, six hundred thirteen thousand, five hundred thirty-nine".