123240334155 has 16 divisors (see below), whose sum is σ = 203984002080. Its totient is φ = 63461689088.

The previous prime is 123240334153. The next prime is 123240334159. The reversal of 123240334155 is 551433042321.

It is a cyclic number.

It is not a de Polignac number, because 123240334155 - 2¹ = 123240334153 is a prime.

It is not an unprimeable number, because it can be changed into a prime (123240334153) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 141655122 + ... + 141655991.

It is an arithmetic number, because the mean of its divisors is an integer number (12749000130).

Almost surely, 2^123240334155 is an apocalyptic number.

123240334155 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

123240334155 is a deficient number, since it is larger than the sum of its proper divisors (80743667925).

123240334155 is a wasteful number, since it uses less digits than its factorization.

123240334155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 283311150.

The product of its (nonzero) digits is 43200, while the sum is 33.

Adding to 123240334155 its reverse (551433042321), we get a palindrome (674673376476).

The spelling of 123240334155 in words is "one hundred twenty-three billion, two hundred forty million, three hundred thirty-four thousand, one hundred fifty-five".