123355426505 has 16 divisors (see below), whose sum is σ = 150053230080. Its totient is φ = 97335745728.

The previous prime is 123355426489. The next prime is 123355426529. The reversal of 123355426505 is 505624553321.

It is a cyclic number.

It is not a de Polignac number, because 123355426505 - 2⁴ = 123355426489 is a prime.

It is a super-2 number, since 2×123355426505² (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 15 ways as a sum of consecutive naturals, for example, 229439 + ... + 547131.

It is an arithmetic number, because the mean of its divisors is an integer number (9378326880).

Almost surely, 2^123355426505 is an apocalyptic number.

It is an amenable number.

123355426505 is a deficient number, since it is larger than the sum of its proper divisors (26697803575).

123355426505 is an equidigital number, since it uses as much as digits as its factorization.

123355426505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 318760.

The product of its (nonzero) digits is 540000, while the sum is 41.

Adding to 123355426505 its reverse (505624553321), we get a palindrome (628979979826).

The spelling of 123355426505 in words is "one hundred twenty-three billion, three hundred fifty-five million, four hundred twenty-six thousand, five hundred five".