123606136509618 has 192 divisors, whose sum is σ = 289249099856640. Its totient is φ = 35213711081472.

The previous prime is 123606136509617. The next prime is 123606136509643. The reversal of 123606136509618 is 816905631606321.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (123606136509617) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 85069604580 + ... + 85069606032.

It is an arithmetic number, because the mean of its divisors is an integer number (1506505728420).

Almost surely, 2^{123606136509618} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 123606136509618, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (144624549928320).

123606136509618 is an abundant number, since it is smaller than the sum of its proper divisors (165642963347022).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

123606136509618 is an equidigital number, since it uses as much as digits as its factorization.

123606136509618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3359 (or 3331 counting only the distinct ones).

The product of its (nonzero) digits is 8398080, while the sum is 57.

The spelling of 123606136509618 in words is "one hundred twenty-three trillion, six hundred six billion, one hundred thirty-six million, five hundred nine thousand, six hundred eighteen".