18201265616 has 20 divisors (see below), whose sum is σ = 35273151972. Its totient is φ = 9098516736.

The previous prime is 18201265613. The next prime is 18201265619. The reversal of 18201265616 is 61656210281.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (18201265613) and next prime (18201265619).

It can be written as a sum of positive squares in 2 ways, for example, as 7572480400 + 10628785216 = 87020^2 + 103096^2 .

It is a hoax number, since the sum of its digits (38) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 18201265616.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18201265613) 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, 60101 + ... + 200036.

Almost surely, 2^18201265616 is an apocalyptic number.

18201265616 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

18201265616 is a deficient number, since it is larger than the sum of its proper divisors (17071886356).

18201265616 is a wasteful number, since it uses less digits than its factorization.

18201265616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 264518 (or 264512 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 38.

Adding to 18201265616 its reverse (61656210281), we get a palindrome (79857475897).

The spelling of 18201265616 in words is "eighteen billion, two hundred one million, two hundred sixty-five thousand, six hundred sixteen".