618661236 has 12 divisors (see below), whose sum is σ = 1443542912. Its totient is φ = 206220408.

The previous prime is 618661231. The next prime is 618661271. The reversal of 618661236 is 632166816.

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

It is a junction number, because it is equal to n+sod(n) for n = 618661194 and 618661203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (618661231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25777540 + ... + 25777563.

Almost surely, 2^618661236 is an apocalyptic number.

It is an amenable number.

618661236 is an abundant number, since it is smaller than the sum of its proper divisors (824881676).

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

618661236 is a wasteful number, since it uses less digits than its factorization.

618661236 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51555110 (or 51555108 counting only the distinct ones).

The product of its digits is 62208, while the sum is 39.

The square root of 618661236 is about 24872.9016401384. The cubic root of 618661236 is about 852.0877105584.

The spelling of 618661236 in words is "six hundred eighteen million, six hundred sixty-one thousand, two hundred thirty-six".