123216363634 has 48 divisors (see below), whose sum is σ = 231586663896. Its totient is φ = 48734784000.

The previous prime is 123216363631. The next prime is 123216363643. The reversal of 123216363634 is 436363612321.

It can be written as a sum of positive squares in 4 ways, for example, as 81651348009 + 41565015625 = 285747^2 + 203875^2 .

It is a super-2 number, since 2×123216363634² (a number of 23 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (123216363631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10059754 + ... + 10071994.

Almost surely, 2^123216363634 is an apocalyptic number.

123216363634 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

123216363634 is a deficient number, since it is larger than the sum of its proper divisors (108370300262).

123216363634 is a wasteful number, since it uses less digits than its factorization.

123216363634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20171 (or 20164 counting only the distinct ones).

The product of its digits is 279936, while the sum is 40.

Adding to 123216363634 its reverse (436363612321), we get a palindrome (559579975955).

The spelling of 123216363634 in words is "one hundred twenty-three billion, two hundred sixteen million, three hundred sixty-three thousand, six hundred thirty-four".