1816556545 has 8 divisors (see below), whose sum is σ = 2188990080. Its totient is φ = 1447163760.

The previous prime is 1816556531. The next prime is 1816556561. The reversal of 1816556545 is 5456556181.

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

It is not a de Polignac number, because 1816556545 - 2¹¹ = 1816554497 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1816556495 and 1816556504.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 758871 + ... + 761260.

It is an arithmetic number, because the mean of its divisors is an integer number (273623760).

Almost surely, 2^1816556545 is an apocalyptic number.

It is an amenable number.

1816556545 is a deficient number, since it is larger than the sum of its proper divisors (372433535).

1816556545 is a wasteful number, since it uses less digits than its factorization.

1816556545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1520375.

The product of its digits is 720000, while the sum is 46.

The square root of 1816556545 is about 42621.0809928608. The cubic root of 1816556545 is about 1220.1586609473.

The spelling of 1816556545 in words is "one billion, eight hundred sixteen million, five hundred fifty-six thousand, five hundred forty-five".