123142106640 has 160 divisors (see below), whose sum is σ = 439165034496. Its totient is φ = 27960307200.

The previous prime is 123142106639. The next prime is 123142106641. The reversal of 123142106640 is 46601241321.

It is an interprime number because it is at equal distance from previous prime (123142106639) and next prime (123142106641).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 123142106598 and 123142106607.

It is not an unprimeable number, because it can be changed into a prime (123142106641) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10969 + ... + 496391.

Almost surely, 2^123142106640 is an apocalyptic number.

123142106640 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 123142106640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (219582517248).

123142106640 is an abundant number, since it is smaller than the sum of its proper divisors (316022927856).

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

123142106640 is a wasteful number, since it uses less digits than its factorization.

123142106640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 485597 (or 485591 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 30.

Adding to 123142106640 its reverse (46601241321), we get a palindrome (169743347961).

The spelling of 123142106640 in words is "one hundred twenty-three billion, one hundred forty-two million, one hundred six thousand, six hundred forty".