216185281492 has 12 divisors (see below), whose sum is σ = 381672245556. Its totient is φ = 107136068480.

The previous prime is 216185281489. The next prime is 216185281493. The reversal of 216185281492 is 294182581612.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 44262268996 + 171923012496 = 210386^2 + 414636^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216185281493) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 239142559 + ... + 239143462.

It is an arithmetic number, because the mean of its divisors is an integer number (31806020463).

Almost surely, 2^216185281492 is an apocalyptic number.

It is an amenable number.

216185281492 is a deficient number, since it is larger than the sum of its proper divisors (165486964064).

216185281492 is a wasteful number, since it uses less digits than its factorization.

216185281492 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 478286138 (or 478286136 counting only the distinct ones).

The product of its digits is 552960, while the sum is 49.

The spelling of 216185281492 in words is "two hundred sixteen billion, one hundred eighty-five million, two hundred eighty-one thousand, four hundred ninety-two".