1618905612 has 12 divisors (see below), whose sum is σ = 3777446456. Its totient is φ = 539635200.

The previous prime is 1618905601. The next prime is 1618905619. The reversal of 1618905612 is 2165098161.

It is a tau number, because it is divible by the number of its divisors (12).

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (1618905619) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 67454389 + ... + 67454412.

Almost surely, 2^1618905612 is an apocalyptic number.

1618905612 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1618905612 is an abundant number, since it is smaller than the sum of its proper divisors (2158540844).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1618905612 is a wasteful number, since it uses less digits than its factorization.

1618905612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134908808 (or 134908806 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 39.

The square root of 1618905612 is about 40235.6261539447. The cubic root of 1618905612 is about 1174.1957646161.

The spelling of 1618905612 in words is "one billion, six hundred eighteen million, nine hundred five thousand, six hundred twelve".