123011335511 has 4 divisors (see below), whose sum is σ = 123979928832. Its totient is φ = 122042742192.

The previous prime is 123011335483. The next prime is 123011335541. The reversal of 123011335511 is 115533110321.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 123011335511 - 2³⁴ = 105831466327 is a prime.

It is a super-2 number, since 2×123011335511² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123011335541) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 484296470 + ... + 484296723.

It is an arithmetic number, because the mean of its divisors is an integer number (30994982208).

Almost surely, 2^123011335511 is an apocalyptic number.

123011335511 is a deficient number, since it is larger than the sum of its proper divisors (968593321).

123011335511 is an equidigital number, since it uses as much as digits as its factorization.

123011335511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 968593320.

The product of its (nonzero) digits is 1350, while the sum is 26.

Adding to 123011335511 its reverse (115533110321), we get a palindrome (238544445832).

The spelling of 123011335511 in words is "one hundred twenty-three billion, eleven million, three hundred thirty-five thousand, five hundred eleven".