123515422050 has 48 divisors (see below), whose sum is σ = 314597132352. Its totient is φ = 32047243200.

The previous prime is 123515421979. The next prime is 123515422057. The reversal of 123515422050 is 50224515321.

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 = 123515421999 and 123515422017.

It is not an unprimeable number, because it can be changed into a prime (123515422057) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11121966 + ... + 11133065.

It is an arithmetic number, because the mean of its divisors is an integer number (6554106924).

Almost surely, 2^123515422050 is an apocalyptic number.

123515422050 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

123515422050 is an abundant number, since it is smaller than the sum of its proper divisors (191081710302).

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

123515422050 is a wasteful number, since it uses less digits than its factorization.

123515422050 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22255083 (or 22255078 counting only the distinct ones).

The product of its (nonzero) digits is 12000, while the sum is 30.

Adding to 123515422050 its reverse (50224515321), we get a palindrome (173739937371).

The spelling of 123515422050 in words is "one hundred twenty-three billion, five hundred fifteen million, four hundred twenty-two thousand, fifty".