123515422051 has 6 divisors (see below), whose sum is σ = 143681205300. Its totient is φ = 105870361716.

The previous prime is 123515421979. The next prime is 123515422057. The reversal of 123515422051 is 150224515321.

It is not a de Polignac number, because 123515422051 - 2⁷ = 123515421923 is a prime.

It is a Duffinian number.

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

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1260361401 + ... + 1260361498.

It is an arithmetic number, because the mean of its divisors is an integer number (23946867550).

Almost surely, 2^123515422051 is an apocalyptic number.

123515422051 is a deficient number, since it is larger than the sum of its proper divisors (20165783249).

123515422051 is an equidigital number, since it uses as much as digits as its factorization.

123515422051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2520722913 (or 2520722906 counting only the distinct ones).

The product of its (nonzero) digits is 12000, while the sum is 31.

Adding to 123515422051 its reverse (150224515321), we get a palindrome (273739937372).

The spelling of 123515422051 in words is "one hundred twenty-three billion, five hundred fifteen million, four hundred twenty-two thousand, fifty-one".