123155130242 has 8 divisors (see below), whose sum is σ = 195599324556. Its totient is φ = 57955355392.

The previous prime is 123155130223. The next prime is 123155130253. The reversal of 123155130242 is 242031551321.

It can be written as a sum of positive squares in 2 ways, for example, as 123045906841 + 109223401 = 350779^2 + 10451^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×123155130242² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1811104823 + ... + 1811104890.

Almost surely, 2^123155130242 is an apocalyptic number.

123155130242 is a deficient number, since it is larger than the sum of its proper divisors (72444194314).

123155130242 is a wasteful number, since it uses less digits than its factorization.

123155130242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3622209732.

The product of its (nonzero) digits is 7200, while the sum is 29.

Adding to 123155130242 its reverse (242031551321), we get a palindrome (365186681563).

The spelling of 123155130242 in words is "one hundred twenty-three billion, one hundred fifty-five million, one hundred thirty thousand, two hundred forty-two".