123661053880 has 768 divisors, whose sum is σ = 401054976000. Its totient is φ = 33254572032.

The previous prime is 123661053871. The next prime is 123661053881. The reversal of 123661053880 is 88350166321.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123661053881) by changing a digit.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 459706386 + ... + 459706654.

It is an arithmetic number, because the mean of its divisors is an integer number (522207000).

Almost surely, 2^123661053880 is an apocalyptic number.

123661053880 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 123661053880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (200527488000).

123661053880 is an abundant number, since it is smaller than the sum of its proper divisors (277393922120).

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

123661053880 is a wasteful number, since it uses less digits than its factorization.

123661053880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 376 (or 355 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 43.

The spelling of 123661053880 in words is "one hundred twenty-three billion, six hundred sixty-one million, fifty-three thousand, eight hundred eighty".