618181816 has 32 divisors (see below), whose sum is σ = 1327271040. Its totient is φ = 264415968.

The previous prime is 618181813. The next prime is 618181843.

618181816 is nontrivially palindromic in base 10.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (618181813) 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, 18735 + ... + 39841.

It is an arithmetic number, because the mean of its divisors is an integer number (41477220).

Almost surely, 2^618181816 is an apocalyptic number.

It is an amenable number.

618181816 is an abundant number, since it is smaller than the sum of its proper divisors (709089224).

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

618181816 is a wasteful number, since it uses less digits than its factorization.

618181816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21643 (or 21639 counting only the distinct ones).

The product of its digits is 18432, while the sum is 40.

The square root of 618181816 is about 24863.2623764461. The cubic root of 618181816 is about 851.8675505130.

The spelling of 618181816 in words is "six hundred eighteen million, one hundred eighty-one thousand, eight hundred sixteen".