1618855226 has 16 divisors (see below), whose sum is σ = 2659784040. Its totient is φ = 735544320.

The previous prime is 1618855219. The next prime is 1618855229. The reversal of 1618855226 is 6225588161.

It is a Cunningham number, because it is equal to 40235²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 1618855225 + 1 = 40235^2 + 1^2 .

It is a super-2 number, since 2×1618855226² = 5241384485495022152, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1618855229) 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, 819935 + ... + 821906.

Almost surely, 2^1618855226 is an apocalyptic number.

1618855226 is a deficient number, since it is larger than the sum of its proper divisors (1040928814).

1618855226 is a wasteful number, since it uses less digits than its factorization.

1618855226 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1641889.

The product of its digits is 230400, while the sum is 44.

The square root of 1618855226 is about 40235.0000124270. Note that the first 4 decimals coincide. The cubic root of 1618855226 is about 1174.1835827979.

The spelling of 1618855226 in words is "one billion, six hundred eighteen million, eight hundred fifty-five thousand, two hundred twenty-six".