1855289479685 has 4 divisors (see below), whose sum is σ = 2226347375628. Its totient is φ = 1484231583744.

The previous prime is 1855289479663. The next prime is 1855289479691. The reversal of 1855289479685 is 5869749825581.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 911906583844 + 943382895841 = 954938^2 + 971279^2 .

It is a cyclic number.

It is not a de Polignac number, because 1855289479685 - 2⁶ = 1855289479621 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 185528947964 + ... + 185528947973.

It is an arithmetic number, because the mean of its divisors is an integer number (556586843907).

Almost surely, 2^{1855289479685} is an apocalyptic number.

It is an amenable number.

1855289479685 is a deficient number, since it is larger than the sum of its proper divisors (371057895943).

1855289479685 is an equidigital number, since it uses as much as digits as its factorization.

1855289479685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 371057895942.

The product of its digits is 1741824000, while the sum is 77.

The spelling of 1855289479685 in words is "one trillion, eight hundred fifty-five billion, two hundred eighty-nine million, four hundred seventy-nine thousand, six hundred eighty-five".