123708661020 has 384 divisors, whose sum is σ = 471496273920. Its totient is φ = 26611835904.

The previous prime is 123708660967. The next prime is 123708661033. The reversal of 123708661020 is 20166807321.

123708661020 is a `hidden beast` number, since 1 + 2 + 37 + 0 + 8 + 6 + 610 + 2 + 0 = 666.

It is a super-3 number, since 3×123708661020³ (a number of 34 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 5193177 + ... + 5216943.

It is an arithmetic number, because the mean of its divisors is an integer number (1227854880).

Almost surely, 2^123708661020 is an apocalyptic number.

123708661020 is a gapful number since it is divisible by the number (10) 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 123708661020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (235748136960).

123708661020 is an abundant number, since it is smaller than the sum of its proper divisors (347787612900).

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

123708661020 is a wasteful number, since it uses less digits than its factorization.

123708661020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23821 (or 23801 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The spelling of 123708661020 in words is "one hundred twenty-three billion, seven hundred eight million, six hundred sixty-one thousand, twenty".