918181864261 has 16 divisors (see below), whose sum is σ = 948082115520. Its totient is φ = 888799962240.

The previous prime is 918181864213. The next prime is 918181864267. The reversal of 918181864261 is 162468181819.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-918181864261 is a prime.

It is a super-2 number, since 2×918181864261² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (918181864267) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2466306 + ... + 2814076.

It is an arithmetic number, because the mean of its divisors is an integer number (59255132220).

Almost surely, 2^918181864261 is an apocalyptic number.

It is an amenable number.

918181864261 is a deficient number, since it is larger than the sum of its proper divisors (29900251259).

918181864261 is a wasteful number, since it uses less digits than its factorization.

918181864261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 348516.

The product of its digits is 1327104, while the sum is 55.

The spelling of 918181864261 in words is "nine hundred eighteen billion, one hundred eighty-one million, eight hundred sixty-four thousand, two hundred sixty-one".