1816855545 has 8 divisors (see below), whose sum is σ = 2906968896. Its totient is φ = 968989616.

The previous prime is 1816855541. The next prime is 1816855559. The reversal of 1816855545 is 5455586181.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1816855545 - 2² = 1816855541 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1816855494 and 1816855503.

It is not an unprimeable number, because it can be changed into a prime (1816855541) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 60561837 + ... + 60561866.

It is an arithmetic number, because the mean of its divisors is an integer number (363371112).

Almost surely, 2^1816855545 is an apocalyptic number.

1816855545 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1816855545 is a deficient number, since it is larger than the sum of its proper divisors (1090113351).

1816855545 is a wasteful number, since it uses less digits than its factorization.

1816855545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121123711.

The product of its digits is 960000, while the sum is 48.

The square root of 1816855545 is about 42624.5885024125. The cubic root of 1816855545 is about 1220.2256021473.

The spelling of 1816855545 in words is "one billion, eight hundred sixteen million, eight hundred fifty-five thousand, five hundred forty-five".