123664859136 has 500 divisors, whose sum is σ = 454729648912. Its totient is φ = 32614907904.

The previous prime is 123664859117. The next prime is 123664859159. The reversal of 123664859136 is 631958466321.

123664859136 is a `hidden beast` number, since 1 + 2 + 3 + 6 + 6 + 48 + 591 + 3 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

Its product of digits (5598720) is a multiple of the sum of its prime factors (80).

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 9512681466 + ... + 9512681478.

Almost surely, 2^123664859136 is an apocalyptic number.

123664859136 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 123664859136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (227364824456).

123664859136 is an abundant number, since it is smaller than the sum of its proper divisors (331064789776).

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

123664859136 is an frugal number, since it uses more digits than its factorization.

123664859136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80 (or 25 counting only the distinct ones).

The product of its digits is 5598720, while the sum is 54.

The spelling of 123664859136 in words is "one hundred twenty-three billion, six hundred sixty-four million, eight hundred fifty-nine thousand, one hundred thirty-six".