1618181472 has 48 divisors (see below), whose sum is σ = 4253059440. Its totient is φ = 538716672.

The previous prime is 1618181447. The next prime is 1618181473. The reversal of 1618181472 is 2741818161.

It is a tau number, because it is divible by the number of its divisors (48).

It is a super-2 number, since 2×1618181472² = 5237022552648173568, which contains 22 as substring.

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

It is a self number, because there is not a number n which added to its sum of digits gives 1618181472.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1618181473) 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, 69418 + ... + 89750.

It is an arithmetic number, because the mean of its divisors is an integer number (88605405).

Almost surely, 2^1618181472 is an apocalyptic number.

1618181472 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1618181472 is an abundant number, since it is smaller than the sum of its proper divisors (2634877968).

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

1618181472 is a wasteful number, since it uses less digits than its factorization.

1618181472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21175 (or 21167 counting only the distinct ones).

The product of its digits is 21504, while the sum is 39.

The square root of 1618181472 is about 40226.6264059019. The cubic root of 1618181472 is about 1174.0206650666.

The spelling of 1618181472 in words is "one billion, six hundred eighteen million, one hundred eighty-one thousand, four hundred seventy-two".