918212890625 has 26 divisors (see below), whose sum is σ = 1148071288122. Its totient is φ = 734375000000.

The previous prime is 918212890571. The next prime is 918212890627. The reversal of 918212890625 is 526098212819.

It is a happy number.

It can be written as a sum of positive squares in 13 ways, for example, as 838264762624 + 79948128001 = 915568^2 + 282751^2 .

It is an automorphic number since its square, 843114912509918212890625, ends in 918212890625.

It is a trimorphic number since its cube, 774158980944775976240634918212890625, ends in 918212890625.

It is not a de Polignac number, because 918212890625 - 2⁶ = 918212890561 is a prime.

It is a super-2 number, since 2×918212890625² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (918212890627) by changing a digit.

It is a polite number, since it can be written in 25 ways as a sum of consecutive naturals, for example, 244138745 + ... + 244142505.

Almost surely, 2^918212890625 is an apocalyptic number.

It is an amenable number.

918212890625 is a deficient number, since it is larger than the sum of its proper divisors (229858397497).

918212890625 is an frugal number, since it uses more digits than its factorization.

918212890625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3821 (or 3766 counting only the distinct ones).

The product of its (nonzero) digits is 1244160, while the sum is 53.

The spelling of 918212890625 in words is "nine hundred eighteen billion, two hundred twelve million, eight hundred ninety thousand, six hundred twenty-five".