1618226555 has 16 divisors (see below), whose sum is σ = 2119237344. Its totient is φ = 1176430080.

The previous prime is 1618226531. The next prime is 1618226573. The reversal of 1618226555 is 5556228161.

It is not a de Polignac number, because 1618226555 - 2¹⁴ = 1618210171 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 204737 + ... + 212493.

It is an arithmetic number, because the mean of its divisors is an integer number (132452334).

Almost surely, 2^1618226555 is an apocalyptic number.

1618226555 is a deficient number, since it is larger than the sum of its proper divisors (501010789).

1618226555 is a wasteful number, since it uses less digits than its factorization.

1618226555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11566.

The product of its digits is 144000, while the sum is 41.

The square root of 1618226555 is about 40227.1867646745. The cubic root of 1618226555 is about 1174.0315678162.

The spelling of 1618226555 in words is "one billion, six hundred eighteen million, two hundred twenty-six thousand, five hundred fifty-five".